Unless youre sure about the cause of a lump or bump, bring your dog in for an exam. If you see fast growth, redness, swelling, pus, an opening, or if the dog is in pain, make that appointment even sooner. The same goes for lumps that are in certain areas, like the face or paws, where surgery -- if needed -- is more complicated, the bigger the growth. Your vet will want to know: If the lump appeared suddenly; Whether its shape, color, or size has changed; Whether your dogs behavior ...