Oh yeah they do. My brother’s dog would nip a little in the house. Mostly playful. I went into his pen one day. He didn’t like that at all. He chewed on me hard. I didn’t back down and kept after him to stop. But I began to wonder a little, because he bit me hard. It was quite a battle, but he didn’t quite draw blood. I got him to stop and he hasn’t done it since, but he knew exactly what he was doing. Both arms were scratched up bad and the next day they were black and blue from my wrist to my elbow.