Best CBD Oil For Cats With Cancer


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【Best CBD Oil for Cats with Cancer 】Find Useful Tips ➦ ThePets ➦Benefits of CBD Oil for Cat Cancer ✔️Can CBD oil help cats with cancer?✔️ Here are some of the best CBD oils to help manage your feline friend’s symptoms, including persistent sores, lameness, and unexplained bleeding.

The 11 Best CBD Oils for Cats with Cancer

Alina A. is a professional writer, editor, and pet-lover. She has published over 50 articles on how to care for pets properly. Alina has been writing articles for 3 years, so she has considerable experience in this niche. Her natural curiosity helps her to expand her knowledge and learn new pet care life hacks, which will make your life much easier.

Dr. Linda Simon is a veterinary surgeon working with seven years of experience. She is a fellow of the British Veterinary Association and specializing in animal medicine. Also, she has been the Woman magazine resident vet for the past two years and writes a regular column for them, focusing on pets and their health.

Updated on: 03/23/2022

Your fluff ball may mean the world to you, however, as felines get older, some of them will develop cancer. For cat parents, this can be a heart-wrenching time.

It is difficult to see your sweetheart suffer, but CBD (Cannabidiol) oil may, possibly provide some relief for some. CBD oil is not to be confused with marijuana. It is not psychoactive and does not cause the cat to ‘get high’. Many pet parents are using CBD in the hope that it could help relieve pain, increase appetite, and enhance the quality of life of their pet. In this article, we explain how CBD products work and how to find the right product for your fluffy friend.

At a Glance: Our TOP-3 CBD Oils for Cats Cancer




1. Capsules: Canna-Pet Advanced MaxCBD

Canna-Pet Advanced MaxCBD may help treat your cat’s illnesses and could improve his appetite. Canna-Pet products focus on the idea of providing felines with useful nutrients to fuel their overall well-being.

2. Mary’s Nutritional Tails Pet CBD Tincture

Tincture comes in 300mg/900mg per bottle. Comes in delicious bacon flavor your cat will like. Broad-spectrum organically grown hemp extract. Third-party lab tested for quality.

3. MedTerra Hemp CBD Soft Chews

MedTerra CBD 30 soft chews help calm your pets. Comes in delicious bacon flavor. This product make you pet calm, relaxed and happy. Allows for different sized cats and dogs.

*All ratings are formed by the article’s author based on own research and combined with customer reviews.

The Best CBD Oils for Cats Cancer Overview

To help you find the product for your feline companion, we looked through dozens of CBD oils for cats with cancer and narrowed our search down to eleven CBD products.

1. Capsules: Canna-Pet® Advanced MaxCBD

Canna-Pet Advanced MaxCBD comes in a bottle of 10 capsules containing hemp grown using organic farming methods. Pet owners can open up a capsule and add its contents to their food. Also, cat owners can mix it with water and place it in the feline’s mouth. It is available as a daily maintenance dose. The capsules are quite easy to use.

Canna-Pet Advanced MaxCBD may help treat illnesses and could improve his appetite. Canna-Pet products focus on the idea of providing felines with useful nutrients to fuel their overall well-being.


  • 240 mg.
  • A bottle of 10 capsules.
  • Comes with hemp grown using organic farming methods.
  • Claims to relieve pains and aches.
  • May improve your cat’s appetite.
  • Easy to use.
  • Acts quickly.
  • Not found.
2. Mary’s Nutritional Tails Pet CBD Tincture

Mary’s Nutritional Tails Pet CBD oil is ideal for both dogs and cats. The oil has a delicious bacon flavor and provides a consistent serving of broad-spectrum organically grown hemp extract. CBD and other plant-based nutrients can influence your pet’s body, mind, and spirit. You can rest assured that Mary’s products are manufactured in some of the greatest industrial hemp plants in Colorado, so your feline companion only gets the best!


  • 300 mg/900 mg per bottle.
  • Comes in delicious bacon flavor.
  • Broad-spectrum organically grown hemp extract.
  • Non-psychoactive substance.
  • Provides your cat with full CBD support.
  • Helps to stay calm and relaxed.
  • Claims to relieve pain.
  • Verified by laboratory tests.
  • Suitable for both dogs and cats.
  • Compact bottle.
  • Not found.
3. MedTerra Hemp CBD Soft Chews

If you’re looking to try CBD tinctures for your cat, consider MedTerra CBD Soft Chews for Cats. This product is 100% natural, and third-party lab tested for purity and potency.

These products are composed of valerian root, chamomile, and l-tryptophan, so your fur baby gets the кшпре ingredients to feel calm, relaxed, and happy. Each chew comes with 10 mg of CBD, making it easier to dose larger pets. Pet parents can also break the capsules in half for their smaller feline friends.


  • 300 mg per bag.
  • 10 mg per chew.
  • Comes with delicious bacon flavor.
  • Features organically grown hemp.
  • Has no GMOs, chemicals, and other harmful additives.
  • No THC.
  • Helps to stay calm and relaxed.
  • Verified by laboratory tests.
  • Suitable for both dogs and cats.
  • Certified by The US Hemp Authority.
  • Not found.
4. Roxy by Hemplucid CBD Tincture for Dogs or Cats

Roxy by Hemplucid has developed a CBD product for dogs and cats — fish flavor for felines and chicken for canines. The manufacturer utilizes the entire hemp plant, so this product contains a robust variety of plant-derived compounds such as phytocannabinoids, terpenes, and some other phytonutrients. Along with CBD, they create a so-called “entourage effect” to help balance the mind and body of your fur baby and potentially fight cancer.

This product is a full spectrum CBD combined with fish oil. It is a delicious and useful addition to your feline’s diet that is safe for daily use. It is also the only fish oil-based pet tincture on the market today!


  • A bottle of 300 mg.
  • Comes in fish flavor for felines and chicken flavor for canines.
  • Contains a robust variety of plant-derived compounds such as phytocannabinoids, terpenes, and some other phytonutrients.
  • Has no GMOs, chemicals or other harmful additives.
  • Helps to stay calm and relaxed.
  • Suitable for both dogs and cats.
  • 100% natural ingredients.
  • Easy to use.
  • Verified by laboratory tests.
  • Not found.
5. HolistaPet CBD Cat Treats

This product is a good treat to reward your fur baby after a long and hard day. These treats are made from real salmon.

Pet owners use this product for a myriad of reasons, including to help their furry friends suffering from anxiety, noise phobias, chronic pain, cancer and more.

These products are made with CBD extract derived from natural hemp grown exclusively in the U.S. None of Holistapet products are imported from foreign countries, where the manufacturer cannot properly control the quality. The treats are tested in a third-party laboratory to ensure the purity and potency of the product.


  • 150 mg per bag.
  • 75 treats per package.
  • Comes in delicious salmon flavor.
  • Broad-spectrum organically grown hemp extract.
  • Has no GMOs, chemicals or other harmful additives.
  • Non-psychoactive substance.
  • Provides your cat with full CBD support.
  • Helps to stay calm and relaxed.
  • Relieves pain.
  • Verified by laboratory tests.
  • Not found.
6. HolistaPet CBD Tincture for Dogs & Cats

HolistaPet CBD Tincture is a good way to provide your cat with CBD. The oil is crafted with organically grown hemp and broad-spectrum CBD oil. Broad Spectrum means that all the compounds found in the hemp plant are saved in the oil.

HolistaPet believes that cats deserve high-quality ingredients. They use the non-GMO, THC-free CBD, sourced from U.S. organic hemp.


  • A bottle of 300 mg.
  • Broad-spectrum organically grown hemp.
  • No harmful additives.
  • GMO-free.
  • Claims to relieve pain.
  • May help to overcome anxiety.
  • Composition verified by laboratory tests.
  • Suitable for both dogs and cats.
  • Easy to use.
  • Not found.
7. Heal Full-Spectrum Hemp Extract (CBD) For Cats

Introduce your fur baby to the right treatment possible with the CBD tincture from Heal. This product is formulated to promote health and well-being while potentially helping in the management of medical conditions, including cancer, seizures, tumors, dementia, and more.

Heal prides itself on offering safe and potent CBD tincture for cats. When pet owners buy Heal products, they know that they are giving their fluffy friends exactly what is meant for them.


  • A bottle of 1100 mg.
  • Suitable for daily use.
  • Organic full-spectrum hemp oil.
  • Has no GMOs, chemicals or other harmful additives.
  • May help to ease their aches and pains.
  • High quality.
  • Easy to use.
  • Verified by laboratory tests.
  • Not found.
8. Wellness Coconut Oil for Cats

You may already know that coconut oil is beneficial human health, but did you know that coconut oil is good for cats’ health too?

Coconut oil is reputed to reinforce the immune system, help with brain health, nourish the skin, and keep a coat shiny and healthy. These potential benefits become especially valuable to our pets as they age.

And now, with this product, your fur baby can get all the benefits of coconut oil and organically grown hemp from one single product.

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  • A jar of 120 mg.
  • Made from organically grown hemp.
  • Includes coconut oil.
  • GMO-free.
  • Has no toxic pesticide residues or other harmful additives.
  • Suitable for daily use.
  • Verified by laboratory tests.
  • U.S. grown.
  • High quality.
  • May help with chronic pain.
  • May bolster the immune system.
  • Nourishes the skin and keeps a coat shiny and healthy.
  • Easy to use.
  • Not found.
9. Royal CBD Pet Oil

Tried using CBD oils for your fluffy friend, but it came to bought? This product is created to unlock potential to thrive, using a delicious flavor — bacon.

Royal CBD Pet Oil improves your pet’s health in many ways. The tincture can help relieve separation stress and calm your pet. It can also bring a stop to aggressive behavior and hyperactivity in your four-legged friend, and if he is suffering from aging-related issues, CBD oil can increase his vitality. Let your kitty enjoy long years of healthy life thanks to broad-spectrum CBD oil.


  • A bottle of 125/250/500 mg.
  • Broad-spectrum organically grown hemp.
  • Bacon flavor.
  • No harmful additives.
  • GMO-free.
  • Relieves pain.
  • Boosts energy.
  • Helps to overcome anxiety.
  • Suitable for both dogs and cats.
  • Easy to use.
  • 30-day money-back guarantee.
  • Not found.
10. ​Soul Pet CBD Oil

Cats can also get stressed. Soul Pet CBD Oil is specifically formulated to eliminate the anxiety in your feline companion and relive pain during receiving chemotherapy. The pet tincture is safe, effective, and has a delicious bacon flavor.

This oil is formulated to the highest quality standards. It contains organically grown hemp and has no GMOs, chemicals, and other harmful additives.


  • A bottle of 250 mg.
  • Comes with delicious bacon flavor.
  • Broad-spectrum organically grown hemp extract.
  • Has no GMOs, chemicals, and other harmful additives.
  • Helps to stay calm and relaxed.
  • Relieves pain.
  • Not found.
11. Procana Vet Formula Softgels

Vet Formula Softgels come with premium hemp-derived CBD. Safe for daily use, they could help regulate the endocannabinoid system. This product is a good option for you if you have a fluffy friend who suffers with chronic pain. Of course, it is always important to discuss the more traditional treatment options with their vet, such as non-steroidal anti-inflammatories and opioid pain relief.

Vet Formula Softgels are formulated to the highest quality standards. They contain organically grown hemp and have no GMOs, chemicals, or other harmful additives. You can rest assured that this product is clean because it is tested for purity by a third party laboratory.


  • 240 mg.
  • A bottle of 30 soft gels.
  • Comes with organically grown hemp.
  • Has no GMOs, chemicals or other harmful additives.
  • Suitable for daily use.
  • Helps balance the endocannabinoid system.
  • Verified by laboratory tests.
  • Safe for human consumption.
  • Not found.

Owners Guide

Types of Cancer in Cats

Just like humans, cats can get cancer at any time in their lives. Many types of cancer threaten the health and well-being of cats. Although there are many more than four types of feline cancer, we will go through some of the most common cancer types in cats, including leukemia, lymphoma, feline squamous cell carcinoma, and mammary cancer.

1. Leukemia And Lymphoma

Leukemia and lymphoma in pets can stem from the feline leukemia virus (FeLV). It can spread from one feline to another, particularly through mutual grooming and sharing of food bowls. That is why, infected cats should not be in contact with healthy pets.

Both leukemia and lymphoma are life-threatening blood cancers, and they can typically be diagnosed with a physical exam, blood test and/or diagnostic imaging.

2. Feline Squamous Cell Carcinoma

Squamous cell carcinoma is skin cancer. Cancerous growths spread in the squamous epithelium, which is the outermost layer of the feline’s epidermis. They can move from one layer of the skin to another, which means it can metastasize (spread throughout the body) over time, especially if it goes unnoticed and untreated.

3. Mammary cancer

Both male and female cats can develop mammary cancer as they both have mammary glands. Sadly, the vast majority of feline mammary cancers are malignant so it is especially important to find and treat them early.

Potential Benefits of CBD Oil for Cats with Cancer

It may offer a whole host of benefits to your feline companion. However, it is crucial to understand that many of these benefits are anecdotal and clinical trials are extremely limited in the world of veterinary medicine.

It has been proposed that CBD oil:

  • Relieves inflammation.
  • Eliminates digestive problems.
  • Relieves nausea.
  • Reduces pain and aches.
  • Helps overcome stress.
  • Reduces seizure frequency.
  • Helps with epilepsy symptoms.
  • Fights disease-causing viruses.
  • Blocks the growth of cancer cells.

Be aware that CBD is not yet established as a treatment for cancer and should not be relied upon for this function. Certainly, it is thought it may help to ease the discomfort and nausea associated with some cancers and there is the potential for some cancer-fighting properties.

Possible Side Effects of CBD in Cats

Before introducing a cat to this product, pet parents need to understand its possible side effects so that they are prepared for potential consequences. While research has shown that CBD appears to be relatively well tolerated within the feline population each cat can have a different reaction and it is especially tricky to predict the reaction of chronically and seriously unwell patients. [6] ​

The likelihood of any side effects may be higher if CBD is used incorrectly. Pet parents who notice negative changes in their pet’s behavior should always consult with their veterinarian.

One possible side effect of consuming CBD hemp product is sleepiness. In general, unwell cats tend to display sleepy behavior, sometimes making this reaction difficult to detect at first.

Aggression, anxiety, nausea, vomiting, weight loss, and changes in appetite are also other potential side effects. Although these symptoms are quite rare, pet parents should stop giving CBD to their pets and immediately schedule a visit with their vet.

How does CBD oil help with cancer in cats?

Research is currently limited both in the human and veterinary world but it is hoped that CBS has many benefits to offer. It is being looked in to as a standalone cancer treatment as well as a medicine to be used adjunctively in those patients suffering from side effects such as nausea and appetite loss.

1. May Help Eliminate Malignant Cells

In 2011, scientists studied how CBD would interact with malignant mammary cells. They learned that CBD can help eliminate malignant cells without causing much harm to healthy cells. Since cancer leads to abnormal cell growth, the results of this study may indicate that CBD can induce programmed death on the malignant cells and regulate cell growth.

2. May Help Stop Tumor Growth

In another study, conducted on mice, it was deduced that CBD may help slow down the growth of malignant mammary cells in these rodents. Also, the scientists found that it can reduce the development of secondary malignancies.

In 2003, a further showed that cannabinoid receptors are present in healthy and malignant skin cells of mice. The scientists found that by activating ECS ​​with CBD, the compounds promoted cell death, helping to slow down the spread of skin cancer. [1] ​ [8] ​

Is CBD oil good for cats with cancer?

These products are not a treatment for feline cancer. However, it may alleviate many of the side effects associated with cancer treatments.

Three common treatment options for feline cancer are surgery, chemotherapy, or radiation therapy. While it is impressive to have these options to fight cancer in cats, these treatments may have some negative effects.

Below you can find the undesirable effects that CBD can help provide relief for when treating feline cancer:

Nausea and Vomiting

Nausea is a common symptom in cats that receive chemotherapy and radiation therapy to control the growth and spread of malignant cells. During this treatment, the cells lining the stomach may be affected, resulting in nausea and vomiting.

There is encouraging evidence showing how CBD can eliminate these gastrointestinal issues.

In 2011, research showed that a lot of animals can benefit from the anti-emetic effect of CBD. Additional evidence also suggests that it may be helpful in treating chemotherapy-induced nausea.

Chronic pain

Malignant tumors in any part of a feline’s body can cause pain. Similarly, those who undergo surgery can experience pain, especially in the period just after the procedure.

As an example, Tramadol is a common pain reliever given to felines with cancer. However, its effectiveness in treating pain is doubtful, and its non-opioid mechanism may not work on cats.

In 2018, canines with osteoarthritis were given CBD to see the pain-relieving effects it had on dogs. The final evaluation showed the dogs had much less pain after the CBD treatment and became more playful and active. This study also showed that there were no negative side effects observed.


In 2000, research showed that these products potentially have strong anti-inflammatory properties. The same study shows the effectiveness of CBD on mice suffering from collagen-induced arthritis and reveals that it may improve the overall condition of these animals. CBD’s products are proved to produce pro-inflammatory mediators, indicating their usefulness as a new anti-inflammatory product. [2] ​

See also  CBD Oil For Endometriosis

Can CBD Oil Treat Cancer in Cats?

There is no solid evidence, yet, as yet, that we can use CBD as a cancer treatment.

We know that cancer often significantly impairs the quality of cats’ life. Symptoms such as lameness, bleeding, aches, and lowered appetite are common in felines with cancer. CBD may help to ease digestive issues, reduce aches, relieve nausea and more. However, owners should also be aware of the more traditional tried and tested medicines available, such as potent anti-emetics and corticosteroids.

When it comes to cancer treatment, the mainstay remains chemotherapy, radiotherapy and surgery where it is an option.

How quickly does CBD oil work in cats with cancer?

It takes approximately 30 minutes to achieve the full effect and lasts for about 5 hours, depending on the cat’s breed, overall health, activity level, and their metabolism. [4] ​

Is CBD legal for cats?

It is not only safe for pets, but it is also legal. CBD for felines is derived from hemp, which means the oils are extracted from hemp plants, not marijuana. Hemp plants naturally contain less than 0.3% THC, making them safe for felines.

There is a misconception that these products should have absolutely no THC. Your fluffy friend can consume CBD, which includes a THC concentration of no more than 0.3%, so your cat will not get high. [5] ​

Keep a close eye on the amount of THC in CBD tincture before introducing your cat to a new product. Make sure the bottle has a label that says ‘CBD oil is suitable for cats’.

Article Sources:

  1. “4 Types of Cat Cancer and Their Common Symptoms.” Rau Animal Hospital, 12 Dec. 2018,
  2. Gamble, Lauri-Jo, et al. “Pharmacokinetics, Safety, and Clinical Efficacy of Cannabidiol Treatment in Osteoarthritic Dogs.” Frontiers, 25 Feb. 2018,
  3. Kogan, Lori R., et al. “Consumer’s Perceptions of Hemp Products for Animals.” American Holistic Veterinary Medical Association,
  4. Llera, Ryan. “Feeding Your Cat During Cancer Treatment.” VCA Hospitals,
  5. Rancilio, Nicholas, et al. “Strategies for Managing Cancer Pain in Dogs and Cats, Part 2: Definitive and Palliative Management of Cancer Pain.” Today’s Veterinary Practice,
  6. Deabold, Kelly. “Single-Dose Pharmacokinetics and Preliminary Safety Assessment with Use of CBD-Rich Hemp Nutraceutical in Healthy Dogs and Cats.” PubMed Central (PMC), 1 Oct. 2019,
  7. Shrivastava, Ashutosh. “Cannabidiol Induces Programmed Cell Death in Breast Cancer Cells by Coordinating the Cross-Talk between Apoptosis and Autophagy — PubMed.” PubMed, 12 May 2011,
  8. Casanova, M. “Inhibition of Skin Tumor Growth and Angiogenesis in Vivo by Activation of Cannabinoid Receptors — PubMed.” PubMed, 1 Jan. 2003,

ThePets is an informational website that features articles written by qualified veterinarians and professional writers. You can learn more about our editorial process. When selecting food for your pet, use Pet Food Finder, and search for the clinic to treat your pet using Vet Clinics Locator.

CBD Oil for Cats with Cancer – August 2022

Can pet owners use CBD oil to treat cats with cancer? Is it safe?

  • Cancer affects cats in many ways and can drastically lower their quality of life. Symptoms such as persistent sores, changing lumps, lameness, unexplained bleeding, and loss of appetite are common among cats with cancer. (1 )
  • Many medications are available to help alleviate the clinical signs of cancer, but can also cause adverse reactions to felines. Cannabidiol, also known as CBD, is a promising solution that could be a natural and safer remedy in treating cancer in cats. (2-3 )
  • Several preliminary studies on CBD have shown that the phytocannabinoid might eliminate cancerous cells in the body (4 ) . Results also showed that CBD inhibited the growth of harmful tumors in a lab setting. (5-6 )
  • Despite the purported benefits of CBD oil, there is a lack of in-depth research regarding its use in animals. Cats that are given CBD formulations may experience side effects such as drowsiness (7 ) , anxiety, nausea, and disorientation.
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Can Cats with Cancer Use CBD Oil?

Cancer is one of the most feared health conditions today, and although it is not as common in cats as it is with dogs, it still affects many felines. Some of the symptoms of cancer in cats include persistent sores, lumps that change in size or shape, lameness, unexplained bleeding, and loss of appetite. (8 )

Despite having no cure, there are many medications available that can alleviate the clinical signs of cancer. However, these pharmaceutical drugs also bring with them adverse reactions and harmful side effects that can only worsen the condition of a pet.

One particularly promising solution comes in the form of cannabidiol (CBD), which is the non-psychoactive component of cannabis and the main compound in the hemp plant.

There is a growing number of owners that are beginning to look towards CBD-based cannabis products to ease pain and other conditions in their pets. (9 ) Although there is no precise data suggesting that CBD can cure cancer, there are studies that point towards its therapeutic potential and compatibility in small animals. (10 )

One study in 2018, for instance, shows encouraging results on the effects of hemp-based cannabidiol and terpenes on dogs suffering from osteoarthritis. The majority of the dogs that consumed CBD oil during the trial experienced significantly less pain and better mobility overall. (11 )

The same study also shows that there were no side effects reported and that the dogs can tolerate a dosage of 2 mg per kilogram bodyweight of CBD oil twice each day. These findings may be an indication that the hemp-based nutraceutical is not dangerous for animals. (12 )

A study on the endocannabinoid system (ECS) reveals that humans and animals, with the exception of some insects and protozoans, share this same system in their bodies (13 ) . The ECS is responsible for regulating the functions of the brain, endocrine, and immune tissues, while it also contains cannabinoid receptors. (14 )

Since animals and human beings also possess the same receptors, this means that cats can be naturally receptive to the cannabinoids present in CBD. This research on the ECS may be proof as to why the dogs in the study mentioned earlier did not experience any adverse effects upon consuming CBD oil.

CBD for Cats with Cancer

Three forms of CBD products for cats are available at this time. These include:

CBD Oils (Tinctures)

Oils are the most popular method in administering full-spectrum cannabidiol in cats. When people mention CBD oil for cats, this typically means using tinctures to help ease symptoms.

Cat CBD oil is given by way of a dropper, which is easily applied in the mouth. There are various flavors available for CBD tinctures that pet owners can choose from today.

CBD Capsules

CBD in the form of capsules is an ideal alternative for use in cats as they are provided in pre-measured portions. Each pill can be administered once or twice a day, depending on the recommendation of a veterinarian.

A capsule may contain 5 to 20 mg of CBD, so it is essential to consult a doctor before application. The pills can also be masked in pet food to make administration easier.

CBD Cat Treats

CBD pet treats for cats are also another way to administer CBD to a feline friend conveniently. Cats enjoy consuming treats that are made for them, and this product makes the application process straightforward.

Keep in mind, however, that the dosage in CBD treats may not be as accurate as with oils and capsules. Again, cat owners should talk to a veterinarian to know the proper dosage they should give to their pets.

Can CBD Oil Treat Cancer in Cats?

There are several clinical studies that were carried out, suggesting that CBD can fight the spread and growth of cancerous tumors in cats.

CBD Might Help Eliminate Cancer Cells

In 2011, researchers carried out an examination of how CBD would interact with breast cancer cells. Although the study was done in vitro, which means that it involved using either a sample dish or test tube instead of a live organism, the results were quite impressive.

In the study, the scientists learned that CBD could help induce programmed death on the cancer cells without causing much damage to the healthy cells. (15 ) How CBD was able to do this is relatively unclear, but the compound was able to help destroy damaged tissues, and cause apoptosis or programmed cell death.

Since cancer is primarily characterized by the abnormal growth of cells, the results of this study may be a hint that CBD can contribute in regulating cell growth.

CBD Can Help Stop Tumor Growth

The Breast Cancer Research and Treatment journal published a similar study in the same year regarding CBD and how it affects cancerous cells in the breast.

The study, although carried out on mice, found that CBD can help slow down the growth of breast cancer cells in these rodents. Additionally, researchers also discovered that it could reduce metastasis or the development of secondary malignant growths. (16 )

Another study in 2003 revealed how there are cannabinoid receptors present in healthy and cancerous skin cells of mice. The researchers targeted these receptors and found that by activating the ECS with cannabinoids, the compounds contributed to cell death while helping slow down skin cancer growth. (17 )

There are also several studies regarding CBD and its ability to inhibit angiogenesis. Angiogenesis is the process that allows cancerous tumors to continue growing by way of developing new blood vessels. (18 )

Side Effects That CBD May Help Alleviate

CBD oil is not an approved treatment for cancer in cats. However, it is capable of providing relief to many of the side effects that come with cancer treatment.

Three prevalent options for treating cancer in cats are done via surgery, chemotherapy, or radiation therapy. Although it is impressive to have these choices to manage cancer cells in felines, these treatments have a lot of undesirable effects, especially long-term.

Below are the side effects that CBD may help alleviate in cat cancer treatment:

Nausea and Vomiting

Nausea is a common outcome for cats that undergo chemotherapy and radiotherapy to control the growth of cancer in their bodies. During such treatment, cells that line the intestines and stomach of a cat can be affected, leading to nausea and vomiting. (19 )

There is encouraging evidence that demonstrates how the manipulation of the ECS in animals can regulate this digestive problem.

A study in 2011 shows that a wide variety of animals have the capacity to use the anti-emetic effect of cannabinoids in their bodies. Additional evidence also reveals that cannabinoids may be useful in treating nausea caused by chemotherapy. (20 )

Since CBD is a phytocannabinoid, it is theoretically possible to use it to engage the ECS of cats after they receive chemotherapy to ease their gastrointestinal issues.

Chronic Pain

Tumors that are present in any part of a cat’s body can cause mild to severe pain. Therapies such as radiotherapy, chemotherapy, and surgery can also lead to pain management issues.

Tramadol is a common analgesic given to cats that are suffering from cancer pain. However, its effectiveness is questionable in treating acute or traumatic pain, and its non-opioid mechanism may not work on felines. (21 ) The latest data suggests doses of 2 mg/kg are effective for tramadol.

In 2018, a study on dogs that had osteoarthritis were given CBD oil products to see the safety and analgesic effect it had on canines. The final assessment showed that the dogs had significantly less pain after the CBD treatment and became more active. (22 )

This clinical trial also reported that there were no ill side effects observed despite being given 2 mg per kilo of body weight every twelve hours for four weeks. (23 )


Squamous cell carcinoma in felines can start as a small patch of sore skin and oral tumors, which, if not healed, could be a sign of cancerous cells present in the body. Inflammation of the skin is one of the most common symptoms of squamous cell carcinoma in cats.

Research in 2000 reveals that cannabinoids, particularly with CBD from the cannabis plant, have strong anti-inflammatory properties. This same study investigates cannabinoid efficacy on mice that had collagen-induced arthritis and showed that it was able to improve the conditions on these rodents. (24 )

A follow-up experiment in 2004 using a novel synthetic cannabinoid acid on mice with arthritis generated the same results. The cannabinoid was found to have suppressive effects on cell immune responses while also producing pro-inflammatory mediators, a hint to its usefulness as a novel, anti-inflammatory product. (25 )

Causes of Cancer in Cats

There are several reasons why cancer can show up in the mammalian body of a cat.


The process of getting older is one of the primary causes of cancer in many cats. There are several reasons as to why aging can cause a higher rate of cancer growth in the body.

One theory is that the mutations on these cells accumulate over the years, which raises the likelihood of cancerous cell division to happen. (26 ) Degeneration of the mammalian body is also another suspect.

For instance, chronic inflammation experienced by cats over the years can damage DNA and weaken the immune system, leading to slow identification and elimination of harmful cells.


Fibrosarcoma is a common soft tissue cancer in cats that is caused by a combination of genetic and environmental factors. Although no specific cause can be identified, most cats that have fibrosarcoma developed tumors at a prior injection site on their bodies. (27 )

Intact Reproductive Organs

Cats that are not spayed or neutered are at risk of developing cancer in their bodies. The spaying of female cats eliminates the possibility of breast and ovarian cancer, while neutering male ones reduce the incidence of prostate cancer. (28 )

Apart from reducing the risk of cancer development, cats can also live longer and healthier lives when they are spayed and neutered. (29 )


These chemicals are believed to cause mutations in the genes that eventually become cancerous cells in the body. Cats can be exposed to the same carcinogens as that of humans, which include those coming from tobacco smoke, asbestos, x-ray radiation, and benzene. (30 )

Possible Side Effects of CBD in Cats

Prior to administering CBD to a cat, pet owners should understand its potential side effects so that they are fully aware and prepared for what could happen. Although studies did show that CBD did not cause any adverse reactions during the trials, every cat can have a different response, and there is always the risk of harm.

The probability of these side effects can be higher with the improper use of CBD. Cat owners that notice a negative change in their pet’s attitude may consult a veterinarian to reduce their CBD dosage.

A potential side effect of CBD hemp oil consumption is drowsiness. (31 ) In many cases, cats tend to portray sleepy behavior, which makes this reaction relatively difficult to notice at first.

Nausea, anxiety, changes in appetite, vomiting, weight loss, and disorientation are also other possible side effects of CBD use in cats. Although these reactions are rare, owners should cease applying CBD and contact a veterinarian immediately when they notice these signs.


Cancer in cats may not be as common as they are with dogs, but the symptoms felines experience can lower their quality of life significantly. Some of these signs include persistent sores, lumps that change in shape or size, unexplained bleeding, loss of appetite, and lameness.

There are many medications that pet owners can buy to help alleviate these symptoms. However, pharmaceutical drugs are known to cause adverse reactions that can only worsen the condition of a cat suffering from cancer.

Cannabidiol (CBD) is a promising solution that offers many potential health benefits in easing the symptoms of cancer in felines. Many pet owners are beginning to look towards high-quality CBD-based products with less tetrahydrocannabinol (THC) to help reduce the pain, inflammation, and other conditions their pets are experiencing.

Preliminary research studies on pet CBD show impressive results with the phytocannabinoid being able to help inhibit and even eliminate cancerous cell growth in the body. CBD may also provide relief to several clinical signs related to feline cancer.

However, the lack of in-depth studies on CBD use in animals leaves many questions unanswered, including the possible side effects of its use. Pet owners that notice any adverse reaction in using CBD should cease its application immediately and consult a veterinarian as soon as possible.

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