As a pet owner, hearing the word “tumour” come out your vet’s mouth is a nightmare.

The sheer sound of the word immediately conjures up all kinds of negative thoughts.

However, tumors aren’t necessarily all bad.

In fact, many are benign, meaning they won’t spread or affect your dog negatively.

And even those that do can often be treated or managed (at least for some time) using special treatments and medicines.

One of those medicines is CBD, an all-natural compound derived from cannabis and hemp plants.

In this article I’ll take a closer look at CBD, what it is, and how it can help dogs with tumors.

I’ll also share some unique details about my experience with using CBD on my Golden Retriever, Rosie.

What are Tumors?

Dog tumors are no different to the tumors affecting humans.

In its most basic sense, a tumor is an unusual lump caused by the abnormal growth of cells.

These cells grow abnormally to form a swelling which we then refer to as a tumor.

Tumors can be malignant or benign.

What Kinds of Tumors Affect Dogs?

Dogs, just like humans, can develop a wide variety of tumors.

Below I’ll outline some of the most common types of tumors affecting dogs.

  • Mast cell tumors: Mast cells tumors affect a specific type of blood cell. They form in the skin and are one of the most common types of skin tumor affecting canines. They generally grow very fast and are usually very red and itchy as they contain histamine. Short-faced dog breeds like Boxers, Pugs, and French Bulldogs are most at-risk of developing these tumors.
  • Lipomas: Lipomas are very common in dogs. They usually form under the skin and are caused by the abnormal growth of fatty tissue. Luckily, lipomas are slow growing and usually harmless. They can usually be detected easily as they form as soft, movable lumps under your pet’s skin. Once they’ve been correctly identified, lipomas are usually left alone unless they impede a dog’s movement or activity.
  • Osteosarcoma: Osteosarcoma is a type of bone cancer affecting a specific type of cell that forms new bones. These tumors tend to affect the bones of the legs, but can also form elsewhere. They tend to affect giant dog breeds like Great Danes and Greyhounds, but also affect other breeds, too. The most common sign of osteosarcoma is limping.
  • Histiocytoma: This tumor affects skin cells known as histiocytes (which actually form part of the immune system). They tend to affect younger dogs (usually under 3 years of age), and usually to affect breeds like the English Bulldog, Scottish Terriers, Boxers, and Chinese Shar-Peis. Histiocytomas are typically benign and tend to regress on their own in just a few months. Some tumors may be removed surgically if they are particularly bothersome for a pet.
  • Hemangiosarcoma: These tumors affect cells in the lining of blood vessels. They almost exclusively occur in dogs and are particularly invasive. They usually develop on the spleen, which has a large blood supply, but may also form in vessels in the heart or skin. Hemangiosarcomas can cause the spleen to rupture, causing pale gums, difficulty breathing, and difficulty getting up. These tumors tend to spread to other parts of the body and are more common in Golden Retrievers and German Shepherds.
  • Melanoma: Melanoma (often just called “skin cancer”) affects pigmented skin cells. Like in humans, these tumors are usually visible on the skin as they form black or dark brown moles. Luckily, melanomas can be benign, although those forming in the mouth and nail bed tend to be particularly aggressive.
  • Lymphoma: These tumors form in the lymph nodes, causing them to swell. This can cause a variety of symptoms, including lethargy, loss of appetite, and coughing. Lymph node swelling is most noticeable under the jaw, in front of the shoulders, and behind the knees. These tumors are usually malignant and are generally treated with chemotherapy.
  • Papilloma: These tumors form as hard, cauliflower like warts on a dog’s lips, mouth, and around the eyes. They can be problematic for dogs as they can be painful and get infected. These tumors will usually develop then disappear within a few months, but they may also be removed surgically if they cause any problems for the dog. Luckily, they are benign.

Note that this list isn’t complete. These are just some of the most common tumors affecting dogs.

What Symptoms do Tumors Produce?

The symptoms your dog displays will vary depending on the type of tumor he/she has.

Some tumors, like melanomas, papillomas, and lipomas will cause noticeable growths that you or your vet will likely spot while inspecting your dog more closely.

Lymphomas, on the other hand, may produce no notable symptoms other than swelling, which can be harder to diagnose.

When affecting the gastrointestinal tract, however, lymphoma can cause vomiting, diarrhea, weight loss, and a lack of appetite.

The symptoms of hemangiosarcoma can vary depending on whether the tumor is visceral or dermal.

Some common symptoms of malignant tumors can include:

  • Limping (especially due to bone tumors)
  • Pain
  • Loss of appetite
  • Vomiting and nausea
  • Diarrhea
  • Sores that don’t heal
  • Lethargy
  • Loss of interest in exercise
  • Stiffness
  • Difficulty breathing and/or coughing

However, keep in mind that some tumors do not cause any symptoms, too.

How are Dog Tumors Treated?

Tumors first need to be diagnosed properly before your vet prepares a treatment plan.

To diagnose a tumor, vets will usually use one of more of the following diagnostics:

  • Lab tests (blood, urinalysis, etc)
  • X-rays and ultrasounds
  • CT scans or MRIs
  • Fine needle aspirate and fluid analysis
  • Biopsy

Once the vet has correctly diagnosed the type of tumor affecting your dog, they’ll usually begin making a treatment plan specifically for them.

If the tumor is benign and doesn’t cause any major discomfort to the dog, your vet will usually opt to leave it be.

If not, the next step is usually surgery to remove the tumor, part of it, or amputate the affected area.

Following surgery, your vet will usually recommend chemotherapy to minimize the growth or spread of the tumor in the future.

Can CBD Help Treat Tumors?

A few years ago, I received the news all pet owners dread most:

My dog Rosie was diagnosed with hip dysplasia and cancer.

Obviously, I was devastated.

But, determined to make her remaining years as enjoyable possible, I quickly began to look for ways to help support her treatment and her overall quality of life.

So, it wasn’t long before I stumbled on CBD.

While I was skeptical at first, I quickly learned about the huge potential of this tiny molecule.

And, once I learned it was completely safe to use on humans and animals, I decided to give it a shot.

And I’m so glad I did.

CBD almost immediately improved Rosie’s condition, helping her deal with the subtle side effects of chemo, while also reducing the pain and inflammation caused by the hip dysplasia.

As I dove deeper into the world of CBD, I soon learned that there was a strong body of evidence showing this compound can help both humans and pets deal with malignant tumors.

It does so in 2 main ways:

First of all, CBD can help your pet deal with the symptoms associated with cancerous tumors as well as the side effects of chemotherapy and other types of treatment.

Secondly, and arguably more importantly, CBD has been shown to help slow the growth and spread of a malignant tumors.

Here’s how:

How CBD Helps Treat Symptoms of Tumors

Some common symptoms of a malignant tumor in dogs include vomiting/nausea, lack of appetite, pain, and lethargy.

Research shows that CBD can help dogs deal with many of these symptoms.

For example, CBD is renowned as an antiemetic, helping dogs deal with symptoms like nausea and vomiting (generally caused by the tumor or chemotherapy).

That’s because the endocannabinoid system (the system responsible for mediating the effects of endo and phytocannabinoids) is involved in many biological processes, including appetite and metabolism.

In fact, research shows that the endocannabinoid system is heavily involved in the mediation of nausea and vomiting.

The system is predominantly made up of 2 receptors (CB1 and CB2).

These receptors are located all throughout the brain and body, including in the gastrointestinal tract.

By stimulating CB receptors in the brain and the GI tract, CBD has been shown to help reduce nausea and vomiting.

Research suggests it does so by binding to a specific type of receptor in the brain (known as 5-HT1A).

By helping reduce nausea and vomiting, CBD can also help dogs regain their appetite, which is often reduced when undergoing chemotherapy.

Other research also shows that CBD can help reduce the pain associated with some types of malignant tumors.

In fact, pain-relief is a very well-documented effect of CBD:

It does so by helping reduce inflammation as well as temporarily blocking pain signals sent to the brain.

Research also suggests that CBD can help pets deal with other symptoms/side effects of malignant tumors and their treatment (like chemotherapy).

CBD Can Slow Tumor Growth and Spread

There is a solid body of research that shows CBD (and other components of cannabis and hemp) can help slow tumor growth and metastasis.

One of the main ways in which CBD does this is by impeding angiogenesis in tumors.

Angiogenesis is the process of forming new blood vessels.

Malignant tumors are able to produce their own blood vessels to bring more blood to the site and keep cells alive.

CBD has been shown to inhibit this process in a variety of ways.

Meanwhile, other studies also show that CBD can help slow the proliferation of cells in tumors, too.

I’ve covered the antitumor/anticancer effects of CBB in a previous articles.

For more information, check out this post on CBD for dogs with cancer.

Using CBD on Your Dog

Most pet owners are nervous about starting their pets on CBD.

And I get why.

However, you can rest assured that CBD is completely safe to be used on your furry friend.

In fact, CBD is completely non-toxic and incapable of producing an “overdose.”

And no, CBD won’t make your dog “high.”

The compound in marijuana that causes the iconic high we associate with “pot” is THC ( or tetrahydrocannabinol).

CBD is another compound altogether.

Here are some tips to help you administer CBD to your pet:

Find the Right Dosage

When giving your dog CBD oil, I usually recommend sticking to a dosage of 2-4 drops administered 2-4 times per day.

When using CBD capsules or treats, the dosage will depend on the strength of the product you’re using.

For these products, it’s always best to follow the package instructions that came with the product.

Remember that there are also topical CBD products for pets like sprays and balms.

These may be beneficial in treating tumors on the skin, such as mall stem tumors, for example.

When using topicals, I suggest applying them 1 per day, assessing how your dog responds, and then adjusting the dosage as necessary.

Read the Reviews

I mentioned earlier that I had great success using CBD on my dog Rosie.

But I’m not alone.

There are thousands of other pet owners all around the globe that give their pets CBD either as a medicine or health supplement.

These people have great results with CBD, and find it helps their pets deal with everything from eating problems to pain and anxiety.

Many of these people also use CBD to help their pets deal with malignant tumors or the side effects of treatment.

Find the Right CBD Product for Your Dog

There are countless CBD products on the market today, and it can be hard for pet owners to choose one over the other.

On my site, I review a variety of CBD pet products to help pet owners like you make informed decisions about their furry friend’s health.

I’ve currently tried CBD product by King Kanine and Canna-Pet and highly recommend both.

In fact, you can read about my experience with these products by checking out reviews of them here:

Canna-Pet Review – Click Here

King Kanine Review – Click Here


Blake Armstrong
Blake Armstrong

Hey I'm Blake, the founder of this website. Our family was fortunately to have discovered CBD products after our dog Rosie was diagnosed with a few common ailments. I truly believe they enhanced her last few years, and it's my passion to spread the word through this website. Thanks for visiting!