I have an Australian/German Shep. mix...prodominantly Australian Shep. I've had him since he was seperated from his litter. He is now 9 yrs old and as friskie as if he were 3yr old. In the house he likes to sleep and cuddle a lot. But when you take him outside, he forgets his age! I've had very little problems with him from puppy to adult with behavior problems. He is super intelligent and full of affection. The biggest problem I can remember that we had with him was seperation anxiety. That was due to him being use to when I was at work my husband was at home and vise versa. When I finally got a job with the same hours as my husband thats when he started showing seperation problems. But we worked with him and it didnt take long for him to realize we were coming right back.