While both dogs and humans are susceptible to skin cancer, the cancer does not usually look the same in both species. Because dogs' skin is covered in hair, the cancer often presents as lumps or masses in and under. Cancer on the nose, inner ear or belly of the dog may look more like that found on humans.
Just as with humans, there are different types of canine skin cancer, including mast cell tumors, melanomas and hemangiosarcomas, according to WebMD. Some breeds that are more likely to get skin cancer include Basset Hounds, Beagles and Collies, and older dogs are more likely to present with signs of skin cancer, with the cancer normally being detected somewhere between age 5 and 10, depending on the breed.