One of my puppies (10 wk old border collie/husky mix) has a tear in the corner of his ear should I take himto a vet for possible repair ie stitches or is it OK to heal on its own? also I am wondering does this naturally happen or did his sister do it during one of their long lasting agressive play sessions, one or the other likes to bite util the other is screaming and I cant stop them and have tried