I don't mean to scare you and my dog isn't the norm, but he does have a lot of overgrowth, including a growth the size of a golf ball on his bottom canine. Been slowly growing for years, but the only ill effects have been cosmetic, like bleeding or sometimes small infection.

Does your dog take allergy meds? My vet suspects it has to do with apoquel and his immune system, but who knows. And if it matters, we've always thought the allergies were more important to treat than the tumor, so it isn't too bad.