Our four month old GSD Jax is the most amazing dog. We've had no trouble at all training him, except he harrasses the cats to no end! He only wants to play with them. In fact, I've seen him pick up his toys one after another and carry them to our siamese, encouraging her to play with him. When the cat doesn't respond to one toy, he drops it and brings her another. The siamese tolerates him and even plays with him until he gets too rough. When he starts biting her we tell him "kisses only!" and he usually obeys. The other cat instigates trouble with Jax. She encourages Jax to chase her so she can turn around and smack the tar outta him. The problem is Jax gets so wound up chasing the cats we end up sending him to his room "crate" to calm down. Tell me he'll outgrow this stage please?!?