Obviously, each dog is different, with varying personality and lifestyle. Shelties, as a whole, are known to nip people. Being herding dogs, it comes naturally to them. My own
… sheltie, however, does not nip; at least, not precisely. She more just bumps her nose against my heels/legs when she's happy and excited. Her teeth rarely touch me. I've never tried to stop this behavior, finding it rather endearing. I do know another sheltie, though, that does have a problem with nipping. He goes to AKC competitions where nipping can disqualify him. But nipping often is not a problem, as shelties rarely bite down hard. If it does become a problem, training should eliminate it. IN SHORT: Yes, they do nip. ( Full Answer )