Skin Cancer in Dogs: Symptoms, Diagnosis & Early Detection

You've heard of skin cancer in people, but can dogs get skin cancer? Dogs can develop several different types of skin cancer and, like in people, each one can have different signs. What does skin cancer look like on a dog? If you notice a suspicious lump or growth on your dog, it's always a good idea to have your veterinarian look at it. Fortunately, the majority of skin growths in dogs are benign, ranging from fatty tumors, or lipomas, to sebaceous cysts.

Can Dogs Get Skin Cancer?

While there's no definitive understanding about what makes some dogs get skin cancer, genetics seem to play a major role. According to the American Kennel Club (AKC), hormonal abnormalities, certain viruses and exposure to chemicals in the environment may also increase the risk of skin cancer in dogs. Direct, prolonged sun exposure may be a risk factor as well, though the National Canine Cancer Foundation explains that, "in dogs, the theory of exposure to sun is less obvious" than it is in humans.

Some dog breeds are more prone to certain cancers than others. Golden retrievers, pugs and boxers, for example, are more likely to develop mast cell tumors, explains Morris Animal Foundation. Labrador retrievers tend to grow benign fatty masses — some can get quite large. Poodles and poodle mixes can also grow benign cysts. When it comes to cancer, however, any dog breed can develop it, so it's important to be on the lookout.

Diagnosis

When you bring your buddy to the vet with a concerning lump, the vet will likely perform a fine needle aspiration. This process involves sticking a simple needle, such as those used for vaccinations, into your dog's mass to extract some cells. Your vet can then examine the cells under a microscope. If anything looks suspicious, they may send the microscope slides to a pathology specialist. Sometimes a few cells on a slide aren't enough for a diagnosis, so your vet may need to perform a biopsy on your dog or surgically remove the entire mass to send off for testing. This is the most accurate way to get a diagnosis.

Presentation

Can dogs get skin cancer? Yes. So, what does skin cancer look like on a dog? Given the variety of skin cancers, signs can vary. As a general rule of thumb, any lump on your dog's skin may be cause for concern, especially if it is new or fast-growing. Some cancers can be firm and others can be soft, so the feel of the growth isn't a reliable indicator. According to Purdue University's College of Veterinary Medicine, one type of skin cancer, cutaneous lymphoma, tends to present first with patches of red, flaky skin. These areas may be accompanied by hair loss and can resemble ringworm.

Another type of skin cancer, malignant melanoma, causes black and pigmented growths, explains BluePearl. Both cutaneous lymphoma and malignant melanoma can quickly become fatal and require prompt diagnosis and treatment. Most other types of skin cancer look like lumps in the skin, and they may or may not have fur.

If you find a lump on your dog, how much should you worry? What are some of the signs to look out for? One cause for concern is rapid growth. Say you pet your dog in that one favorite spot all the time. One day, you notice a small lump. The next day, it's doubled in size. This could be a sign of trouble. Another sign to watch for is a mass that seems to be bleeding for no reason. Whether or not your dog licks or pays attention to a mass, however, isn't generally a good indicator of a cancerous growth.