Dog Growing Moles. Tumors caused by mast cells are cancerous. Moles on dogs are particularly common on dogs with darker pigmentation in their skin, although of course due to their fur, your dog of any colour might have several moles that you are not aware of.
When you are examining your dog’s moles or have spotted a new one, keep an eye out for the following indications that the mole may be changing and so, potentially have become malignant: Dog can develop moles, though they are slightly less common in dogs than they are in humans. If you see fast growth, redness, swelling, pus, an opening, or.