I know puppies are hyperactive, but I don't know what to do with our puppy. We got him a week ago at 10 weeks. He is half chihuahua, part yorkie, and part sharpei. He weighs 3 lbs. This puppy runs and plays for up to 6 hours straight. I mean that literally. He'll run for hours then sleep for hours. He's taken to play biting and has a very strong jaw. He bites feet, toes, fingers, arms, pretty much any body part he can reach. My arms are black and blue and he drew blood twice today. He doesn't react to any correction at all. The more wound up he gets, the worse the biting is. I have toys and a puppy nylabone that I try to use in place of my fingers. We have a crate for him, and today I got so tired of him biting that I put him in there for about half an hour. He finally calmed down. We have a tiny place and so no room for a gated play area. We are home all the time. Anyone have any suggestions? Should I be crating him more, as a time out kind of thing? Should I find puppy classes for him? I read the pinned thread on biting, but his behavior is different so I don't know how to apply the instructions. Like he doesn't blink when I react to a bite. I've had puppies before, but they never played as aggressively as this puppy does and I'm not sure how to handle it.