One of the oddest features I needed to get used to, when Comet became part of the household were a couple of skin tags under his coat. The first weekend he was with us, I was a little unnerved thinking a large bloated tick had fastened itself to our new family member. At his first veterinary checkup post-adoption, our vet set my concerns to rest. In this case these were benign growths which affects some breeds.
I noted that Dexter also has one. None of these have raised alarm, though we still have the veterinarian advise us when they go in for a checkup.
It's a Dog's Life 