man using cbd oil to treat dog with a tumor

CBD Oil for Dogs With a Tumor: How Does It Work?

First, Let’s Talk About Tumor

Hearing that your dog has a tumor, especially a malignant one, can truly shatter your heart. There’s nothing worse than finding out that your furry best friend will spend their whole life in pain. And as pet owners, it’s almost as painful to see your fur baby suffer because of their tumor or cancer.

Although there are already existing procedures for treating cancer, you still have a lot of things to consider. The conventional treatments for dogs with cancer are very limited and pose their own health risks. At the end of the day, you’ll be the one deciding if you want your dog to go through the painful process of surgery, chemotherapy, or radiation therapy, just so you can have more days with your pooch.

Thankfully, there are medical and scientific breakthroughs that led to the discovery of CBD and its natural therapeutic properties. Today, CBD is used as a natural remedy to treat various health conditions in humans, dogs, and other animals.

Here you will find out the healing benefits of CBD and how it works against tumors in dogs.

What’s a tumor?

A tumor is defined as the abnormal growth of tissue or uncontrolled multiplication of cells that doesn’t present any important physiological function. A tumor generally presents itself through lumps or a swollen part in the body.

Tumors are categorized into two: benign and malignant. Benign tumors can’t spread or affect another healthy tissue. In most cases, benign tumors can be life-threatening, especially if not treated properly or immediately.

Meanwhile, malignant tumors, also known as cancers, can spread and affect other organs and tissues. A malignant tumor is very invasive and a big health risk for those affected.

A lot of tumors that are found in dogs are actually benign. This is very positive news as benign it is not cancerous. It can be treated effectively with various treatments that your vet will offer you. But if it is malignant, it means it is cancerous, but it can also be treated in some cases.

What are the most common types of tumor in dogs?

Tumors can affect any organ or tissue, but for dogs, these are the most common types of tumors.

lymphoma b-cell magnification


Lymphoma is a type of cancer in the blood, mainly the white blood cells called lymphocytes. This type of cancer causes tumors to grow in the lymph nodes. From all the other types of tumors in dogs, lymphoma makes up 20-24% of dogs’ cancer population. The most recognizable sign of lymphoma is a swollen lymph node that can occur in various body parts, including under the jaw, shoulders, legs, armpit, or groin.


Papilloma is categorized as a benign tumor known as dog warts that are usually in a shape or form of a cauliflower. It’s caused by the canine papillomavirus (CPV1), a highly infectious disease transmitted through direct contact. Papilloma can appear on the dog’s lips, mouth, including tongue and gums, or eyes. This type of tumor can be painful, making it difficult for the dog to swallow or chew. It usually only lasts a few weeks or months until it goes away.

Mast Cell Tumors

Mast cell tumors (MCT) are the most common type of tumor in canines. It involves the mast cells, which are immune cells that play a role in your dog’s allergic response and can be found all over the body. Mast cell tumors can grow anywhere on your body but are mostly found in the skin. It can also be found in the lungs, digestive tract, and urinary tract. MCT usually takes the form of a cyst or a swollen part of the body.


Lipomas are another type of benign tumor growing from the fatty layer under the skin. It’s also one of the most common types of tumor in canines. Lipomas are not life-threatening unless they grow in a part of the dog’s body that affects their mobility or movement. They can appear on any part of the body with fat cells but can also grow internally, affecting organs, bones, or muscles, which can be quite discomforting for the dog.


Osteosarcoma is the common type of bone cancer in dogs and mostly affects the bone in their rear and front legs. However, this type of bone cancer can also occur in other bones such as the skull, spine, or ribs. This condition is very common among large to giant breed dogs like Golden Retrievers, Great Danes, Great Pyrenees, Greyhounds, and more.

Osteosarcoma is aggressive cancer and a very painful one. If not treated accordingly, it can lead to swollen limbs, bone fractures, and lameness. The most recognizable sign of osteosarcoma is limping on the affected leg.


Histiocytoma is a type of tumor that targets the skin cells part of the immune system, called histiocytes. It’s very benign and doesn’t require surgery to remove as they usually go away on its own. But if it causes some discomfort for your dog, it can be taken out through surgery. The most commonly affected dog breeds are Boxers, English Bulldogs, Pittbull Terriers, Scottish Terriers, Boxers, Chinese Shar-Peis, etc.


Hemangiosarcoma is a malignant tumor that grows in endothelial cells. These cells are responsible for lining the blood vessels and play a critical role in cardiovascular health. It mostly targets the spleen, where most of the blood supply is, but this can also occur in the heart, skin, or liver.

They progress slowly and will only show signs of hemangiosarcoma until the tumor ruptures, eventually causing internal bleeding. Other signs are pale gums, difficulty breathing, lethargy, exercise intolerance, anxiousness, depression, and sudden collapse. It’s mostly common in German Shepherds and Golden Retrievers.


Melanoma is a skin cancer that causes dark pigmentation in the skin and can form in any part of your dog’s body. They are malignant tumors that occur in the mouth, nail bed, or skin, but some cases are benign. The most commonly affected dog breeds are Schnauzers, Scottish Terriers, and Doberman Pinschers.

Mammary Gland Carcinoma

Also known as mammary cancer, this type of tumor develops from the mammary or the breast tissue in female dogs. A malignant tumor in the mammaries is common in female dogs that have not been spayed. The chances of this type of tumor being cancerous is 50%, and there’s also a 50% chance that a dog diagnosed with mammary cancer will survive.

How will you know if your dog has a tumor?

Each individual type of tumor comes with its own particular symptoms. Sometimes you may think the symptoms of a tumor are actually symptoms of something else.

However, some tumors are easy to spot and highly visible. For instance, with melanomas, papillomas, and lipomas, a clear growth will appear that will be visible to your eye. Although some growths might be quite small, so you will have to keep an eye out for them.

This isn’t always the case, though, as lymphoma cancer does not necessarily produce any symptoms, so you will not be aware that your dog has it, and this can make it very tricky to diagnose. But when lymphoma affects the gastrointestinal tract, there will be physical symptoms that you will be able to see, such as vomiting, diarrhea, weight loss, and a lack of appetite.

Here are the common signs and symptoms of tumors in dogs.

  • Limping
  • Pain
  • Loss of appetite
  • Diarrhea
  • Sores that don’t heal
  • Lethargy
  • Loss of interest in exercise
  • Stiffness
  • Difficulty breathing/ coughing

How are tumors treated?

If you think that your dog may have some type of tumor, your first step is to take them straight to the vet. When you’re at the vet’s, they will diagnose whether or not your dog has a tumor. They may run some of the following checks to see what type of tumor it is exactly: blood tests, urine tests, x-ray, ultrasound, CT scans, MRI scans, fine needle aspirate, fluid analysis, or a biopsy.

There are different ways to treat a tumor, depending on its type. The vet will either suggest chemotherapy, radiation therapy, or surgery. It all depends on what the vet sees fit for your dog and how severe the tumor is.

Best CBD Oil to Treat Dogs With Cancer and Tumor

1. King Kanine King Kalm CBD Oil

King Kanine King Kalm CBD Oil

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Product Specifications

  • Brand: King Kanine
  • Breed Size: Large Breeds
  • Total Weight: 300mg CBD per 30mL bottle
  • Special Diet: All-natural, Gluten-Free, Organic

Our Review

King Kanine King Kalm CBD Oil deserves our number 1 spot on this list. Why? King Kalm CBD Oil combines broad-spectrum CBD oil, krill oil, and hemp oil to make a CBD product with powerful therapeutic properties. Each product is formulated to support your dog’s health and other pets.

Krill oil and hemp oil combined with broad-spectrum CBD includes a variety of healing benefits. This dog CBD oil treats skin diseases with its Omega-3 rich and anti-inflammatory properties. King Kalm CBD Oil has other curative properties such as reducing pain and inflammation, treating canine cancer, and alleviating physical discomfort in dogs.


+ Third-party lab tested
+ With benefits of superfood krill oil
+ Rich in Omega-3 fatty acids
+ Promotes immune health
+ Less than 0.3% THC


– Pricey
– Possible side effects are lethargy and loss of coordination

Why We Like It – King Kanine has produced the best CBD oil that’s great for all-around treatment. Many pet parents have already testified about the effectiveness of using King Kalm CBD Oil for their dogs with cancer and suffering from pain. The use of high-quality and naturally occurring hemp in this pet CBD oil is one of the biggest factors of its curative properties.

2. Honest Paws CBD Oil

Honest Paws CBD Oil

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Product Specifications

  • Brand: Honest Paws
  • Breed Size: All Breed Sizes
  • Total Weight: 250mg CBD per 30mL bottle
  • Special Diet: Organic, Full-Spectrum Hemp Oil, Gluten-Free, Soy-Free

Our Review

Honest Paws CBD Oil is one of the pet-favorites CBD oil products. Honest Paws uses organic full-spectrum hemp oil, plus the added benefits of CBD and terpenes. This gives dogs with cancer a natural alternative treatment to conventional cancer treatments without the risk of experiencing painful side effects.

Other than full-spectrum CBD, there’s also chamomile with calming effects and promotes a healthy brain function. This CBD oil’s calming properties have helped many dogs suffering from severe anxiety. The included terpenes have benefits including antioxidant, anti-anxiety, anti-epileptic, and anti-tumor properties.


+ Organic full-spectrum hemp oil
+ Benefits of chamomile oil
+ Naturally occurring CBD and terpenes
+ For pet wellness, comfort, and happiness
+ GMO, soy, corn, and contaminant-free


– Doesn’t offer international shipping
– Side effects include drowsiness

Why We Like It – Honest Paws is one of the best brands you can rely on to produce the highest quality CBD natural supplements. They have a line of CBD oils, treats, and topicals that caters to different health issues. Honest Paws has specialized CBD products for Mobility, Well, Relief, Calm, Immunity, and Skin and Coat.

3. HolistaPet CBD Oil

HolistaPet CBD Oil

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Product Specifications

  • Brand: HolistaPet
  • Breed Size: All Breed Sizes
  • Total Weight: 150mg CBD per 15mL bottle
  • Special Diet: Natural, Organic, Non GMO, Gluten-Free, Dairy-Free, THC-Free

Our Review

HolistaPet’s number one priority is your pet’s health and comfort. That’s why they created this natural remedy, HolistaPet CBD Oil, to support your dog’s overall well-being. It’s even better because it doesn’t contain any side effects that you would usually get in traditional prescription drugs.

Holistapet CBD Oil uses the natural benefits of broad-spectrum CBD and hemp seed oil to provide relief and comfort. The hemp seed oil also has existing anecdotal evidence of therapeutic properties. This includes improving skin and coat, reducing the risk of heart disease, and aiding digestion. Lastly, it’s also filled with plant-based proteins, vitamins, minerals, and Omega fatty acids, good for overall health and nutrition.


+ Non-GMO, no gluten, no dairy, and no additives and preservatives
+ Include benefits of organic superfood hemp seed oil
+ 0% THC, no high side effects
+ Nutrient-rich hemp CBD oil
+ Third-party lab tested for quality, accuracy, and effectiveness


– No international shipping
– Possible side effects include drowsiness, change in appetite, queasiness, and diarrhea

Why We Like It – HolistaPet’s CBD oil for dogs has been used as a tumor and cancer treatment by many pet owners. Their product has treated many dogs with cancer and tumors based on their reviews. Some of those are bone cancer, brain tumor, and other cancerous tumors in the liver, nasal, and pituitary. Essentially, this pet CBD oil has helped improve many pets’ quality of life.

4. Canna-Pet Advanced MaxCBD Liquid

Canna-Pet Advanced MaxCBD Liquid

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Product Specifications

  • Brand: Canna-Pet
  • Breed Size: All Breed Sizes
  • Total Weight: 680mg CBD per 10mL bottle
  • Special Diet: Full-Spectrum CBD Oil, Organic, Vegan

Our Review

The Advanced MaxCBD formula of this Canna-Pet Advanced MaxCBD Liquid is for pet owners who want the maximum healing effects of CBD in just a few drops. Its improved bioavailability is designed for easier absorption directly on the mouth. Also, there’s no need for adjustments with your dog’s current medication or supplement to use this CBD oil.

Canna-Pet only uses all-organic and natural ingredients. Including the whole-plant hemp extract with the benefits of more than two dozen CBD, terpenes, and flavonoids. It’s 15x more effective than the regular CBD product because of the heightened CBD and terpene levels. If you want to provide comfort and relief for your dog without psychoactive side effects, you can bet on this one!


+ 100% organic full-spectrum CBD oil
+ Improved bioavailability and absorption
+ 15x more effective
+ Higher levels of CBD and terpenes
+ No alcohol, no hemp carrier oil


– Doesn’t ship in Australia, Canada, New Zealand, Singapore, and South Korea
– Pricey

Why We Like It – Canna-Pet is not only famous for its CBD oil products. They also have Canna-Pet CBD Bacon Treats that dogs love and the Canna-Pet Advanced CBD Capsules for felines. Canna-Pet has gained over a thousand testimonials. And their loyal customers continue to grow because of the high-quality CBD products they produce.

Guide on Using CBD to Treat Cancer and Tumors

cannabis oil spelled by wooden tilesHow CBD Works as a Natural Remedy

All humans and animals have what we call the endocannabinoid system. This system is responsible for regulating many processes in the body, such as sleep, pain, appetite, metabolism, mood, memory, stress, and more.

There is still continuous research on how CBD works with the body. But most scientists believe that CBD interacts with the endocannabinoid receptors in the body, namely CB1 and CB2 receptors. CB1 receptors are located in the brain, central nervous system, and other organs like the liver, kidney, and lungs. Meanwhile, CB2 receptors are found in the immune system.

When the CBD interacts with these cannabinoid receptors, it can help maintain balance in the whole body. For example, if a dog is stressed, the body increases the production of a stress hormone called cortisol. Essentially, this activates your dog’s flight-or-fight response, elevates the heart rate, and causes anxiety.

In this situation, CBD will interfere with the receptors responsible for releasing the stress hormone. This will intercept the production of cortisol, thus preventing elevated heart rates and relieving the anxiety and stress the dog experienced.

CBD Reduces Side Effects of Cancer Treatment

Chemotherapy and radiation therapy are two proposed forms of cancer treatment for human and dog cancer. However, these treatments pose various side effects, including pain, nausea, insomnia, loss of appetite, and vomiting.

Some studies claim CBD can reduce or relieve the side effects of chemo or radiation therapy, such as nausea and vomiting. Other than that, CBD is also used as pain management and pain relief supplement because of its anti-inflammatory properties that help reduce pain.

It’s been used as an alternative to painkillers because of its ability to alleviate inflammation pain without experiencing psychoactive or harmful side effects.

CBD Slows The Spread of Cancer Cells and Stops Tumor Growth

There also various studies that talks about CBD’s anti-cancer and anti-tumor properties that potentially helps in preventing the spread of cancer cells and shrinks the tumors on the body. A 2017 study published in the British Journal of Clinical Pharmocology shows the potential of CBD as an anti-cancer drug.

To know more about this, read our article CBD Oil for Dogs With Cancer – Can CBD Really Help?

CBD Boosts The Immune System

Besides being an anti-tumor medication, CBD also possesses antioxidant properties and anti-inflammatory effects, which can help protect or boost the immune system. CBD acts as a modulator of a weakened or overactive immune system to restore its function to its natural state.

Possible Side Effects of CBD in Dogs

CBD side effects are incredibly rare, and it only happens if you go over the recommended dosage for your dog. Nevertheless, it’s good to be aware of the possible side effects of CBD in dogs. And these are drowsiness, diarrhea, vomiting, dry mouth, and low blood pressure.

CBD Success Stories of Dog Owners

Read these amazing testimonials from fur parents who have had experience in using CBD to treat dog cancer and tumor.

From Felicia – Fur Parent

Felicia is a pet owner of a 50lb dog who, in unfortunate circumstances, was diagnosed with a malignant nasal tumor. Luckily, Felicia did her research and found an alternative cancer treatment to the initially prescribed medications for her dog.

That’s where HolistaPet CBD Oil comes into the picture. Instead of the traditional painkillers and cancer transcription drugs, Felicia decided to switch to CBD oil because it’s more natural. Holistapet’s CBD oil has done so much to contribute to her pooch’s improvement. Now, Felicia’s dog is not experiencing any more pain, and even her vet noticed that her tumors have shrunk.

The vet was impressed by the improvement in her dog’s overall condition and said it was rare to achieve that result from a short time. It’s most likely that the CBD oil’s anti-inflammatory and anti-tumor properties have helped with her continuous recovery.


Max is a 125lb Ridgeback diagnosed with osteosarcoma way back in May, during the Memorial Day weekend. His bone cancer got progressively worse as his tumor increased to the size of a tennis ball. Max was experiencing so much pain to the point that he refused to put any weight on his affected leg. Basically, his mobility became worse because of his bone cancer.

With no hope from other traditional cancer treatments, Max’s fur parent decided CBD was worth a try. That’s when they started giving Max, Honest Paws Mobility CBD Oil with turmeric. His tumor shrunk, and it’s almost like it wasn’t there anymore. Even if you touch it, Max doesn’t feel any pain.

He also made a significant improvement recently by climbing on the couch after months of having trouble, even with just walking. Max is now back to being active and goofy, and his fur parent can’t feel more blessed and happy for his beloved doggo.


a beautiful black dog named Stella
Image of Stella from Canna-Pet

Another canine cancer medical miracle that involves CBD is Stella’s story. Stella is a beautiful fur baby diagnosed with six malignant tumors in the lungs. One of the tumors was large, and the other five were small ones. Stella’s oncologist said that she didn’t have time left and insisted on chemotherapy as the dog’s cancer treatment plan.

But Stella’s fur parents disagreed with this type of cancer treatment, so they tried to look for an alternative. Stella’s owners researched and discovered CBD and how it has helped dogs with cancer, and how it can shrink tumors.

They got a recommendation from a friend who also had a dog that suffered from a tumor and has used Canna-Pet to treat canine cancer, and now their dog is doing well. Having this recommendation, they started giving Canna-Pet CBD Oil to Stella, and her 5 small tumors have shrunk and the only one left is the large one.

Stella’s oncologist is very impressed with her improvement. Stella’s fur parents can’t be happier with their decision to use CBD. Thanks to Canna-Pet, Stella is more energetic, pain-free, and happy!

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Frequently Asked Questions

Is CBD legal to use on dogs?

CBD is legal to use on dogs as long as it meets the standard legal THC content of less than 0.3%. Additionally, CBD products derived from a hemp plant are considered legal. Although hemp and marijuana belong to the same family of the Cannabis sativa plant, they’re still mostly different.

Their one major difference is hemp plants only contain little to no THC content, specifically less than 0.3%. While marijuana has a higher THC concentration than hemp, its purpose is more medical or recreational.

Can CBD make my dog high?

There are many reasons why some people may be concerned about giving their dog CBD. Some, if not most, associate it with the ‘high’ side effects of marijuana but don’t worry, CBD will not make your dog high. CBD has less than 0.3% THC; therefore, no one can get high from it, as it is not psychoactive.

What’s the right CBD dosage for my dog?

Finding the right CBD dosage for your dog will depend on your dog’s size, weight, current health condition, and how severe it is. The general recommended dosage of CBD oil is 2 to 4 drops a day administered 2 to 4 times a day.

For other forms of CBD, the recommended dose will depend on the concentration of CBD per treat or capsule. Usually, you’d find a CBD dosage chart on the packaging of the CBD product. You can follow those for an accurate dose.


This article aims to provide you a detailed guide about the best CBD oil for dogs and how it can be used to treat cancer. Hopefully, we have provided you enough information about the health benefits of CBD in treating dog cancer and tumor. As long as you’re aware of the potential risks and side effects of CBD, I can say that it’s worth a try as long as it’s for your dog’s wellness and health.

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