We are still having trouble with Cassie and Boomer. They are together while I'm at school....he in the crate and she on her bed right beside the crate. But, I'm really afraid Boomer will hurt her by knocking her down because her back legs are getting weak (she's almost 14), and I'm afraid she will actually bite him instead of just snapping because her eyesight isn't as good as it was...So, it has been and will continue to be a slow process based solely, I think, on Boomer's maturity....he is, as someone said so well a "typical outgoing, rude silly little puppy!" We probably should have gotten another pup when Cassie was younger.