I have a shih-tzu yorkie mix and he will be 4 months old on april 14th. I just wanted to ask some questions about training my puppy. His name is Buster. We have two cats, and one of our cats hates the dog, will growl at him and hiss and meow. The other cat is older and he is more tough than the other and doesn't really care about the dog. The trouble is that the cats look alot alike, both black and white, the bigger one just being fatter and long hair. Well Buster really wants to play with the cats, and so whenever he sees them he chases them and barks at them, won't bite them or anything, just chases them and barks at them. The older one just walks and lets the dog bark like whatever, go ahead and bark. The problem is that before we got buster, melvin (the younger cat) was my baby and so I think that he just feels horrible. On top of that, we moved a couple weeks before getting Buster, and Melvin HATES moving! What should we do about Buster and the cats? Any suggestions would be greatly appreciated! Another thing is Buster really likes to chew and bite and when you are trying to pet him, he wants to chew on you, replacing your hand with a toy, only works for a short time. And telling him no, doesn't work at all. When you are sitting with him on the couch he is just a complete spaz and when you tell him no and give him a toy he will start barking at you and leap at your face and nip at your face. Are all puppies like this? One more thing, are shih tzu or shih tzu mixes hard to potty train? Seems like he's not getting it! But we love him!! Please give suggestions!!