Dewclaws aren't used like human thumbs; they're too far away from the toes and not opposable. Some dogs use them when turning - generally the herding or coursing breeds - but at less than full-gallop gaits, the dewclaws don't even touch the ground. Dewclaws do need regular attention, as they tend to grow more quickly than toenails (since they don't get as much regular wear) and quite often grow right into the leg; they also can easily catch on things and tear (and bleed like mad!), and are extremely difficult to heal. They are generally removed for the show ring, so most Boxers from responsible breeders will not have dewclaws. 112 lbs. is enormous for a Boxer! :eek: Quite often such extremely oversized dogs are prone to hip dysplasia or other joint-related disorders, so three cheers for him making it to 10 without any problems!