Help! I have a 5 month old male JRT pup. He is a great dog and is learning fast but I need help to assisst him to learn that he must not go after the cat. The cat has been ill and has no front claws. She likes him and wants to be friends with him but does not want to play like a puppy. At this point I am crate training him and keep him on a long 6' lead the rest of the time. Any suggestions? Thanks.