We’ve already covered the signs of canine cancers, now let’s quickly cover the different, most common types of dog cancer.


This type of dog cancer is found in the lymph nodes or bone marrow and usually diagnosed in dogs between 6 to 9 years old. It attacks the dog’s immune system and will spread rapidly if not addressed.

There are five stages of lymphoma in dogs, with each having their own treatment options and prognosis. Dog lymphoma is usually first noticed in a painless but swollen lymph node behind your dog’s neck or knees.


Malignant cancer of the blood vessels, hemangiosarcoma, is more commonly found in dogs than any other species. It is most often found in the spleen, liver, and heart but can spread to any organ or occur just below the skin.

Unfortunately, there are no obvious early warning signs with hemangiosarcoma, and oftentimes it is not found until it is in its advanced stages. This type of canine cancer is most frequently found in large breeds like German Shepherds or golden retrievers.


A type of skincare that you’ve likely heard about due to its frequency in humans, melanoma is most often found in or around a dog’s mouth or lips. It can also be found in their nail beds, footpads, and eyes.

Melanoma in dogs can be particularly aggressive, spreading from the skin deep into a dog’s organs. Early signs of melanoma in dogs include swollen paws, a draining eye, or sores in or around their mouth.