We have a 3 year old pure bred Aussie. Jake is blue merle (white, black & gray) with blue eyes. Beautiful dog. We got him at the Humane Society - 20 bucks (including neutered). He is deaf. Idiot breeders bred two blue merles, got the recessive gene - realized he was deaf (and now basically worthless -to them anyway) and dumped him.
We had just lost our collie-beagle mix of 11 years (my dog) and DH went to the shelter to see what they had. I wasn't ready for another dog - wasn't over it. My boys (7 & 9 at the time) took one look at Jake and said we had to get him - he was adorable and so affectionate. They said once people found out he was deaf, they wouldn't want him and he'd end up being put down. Couldn't say no to that.
He was a challenge - they are herders. Spent the first few months being "herded" and having my ankles bit. Thankfully, he outgrew it. There was the usual chewing that puppies will do. Liked to jump on and over furniture. We crated him and he picked up housetraining pretty easily. Training was not easy, he doesn't hear "NO". Everything is hand signals so there always had to be eye contact. Fortunately, they are a breed that is always watching. He listens pretty well, picked up the hand signals pretty easily. He can sit, lay down, give his paw and will come when we signal. Aussies are VERY, VERY INTELLIGENT. They needs LOTS of exercise and space to run. Jake is the most affectionate, gentle and loving dog I've ever seen. Very friendly. He is one of the most agile dogs I have ever seen. He also burps, likes to sleep in the bathtub on occaision and waits by the door to drive the kids to school with me. He can get a bit of a stubborn streak. He does shed a lot.
We had one issue with destructive behavior. After about two years, when he was left alone he would knock things over. Lamps, chairs, garbage cans. loose items on tables. So we went back to crating him when we're gone - problem solved.
All in all, as a puppy he was a challenge. They're an energetic breed. The nipping can be an issue with small kids - our special circumstances with his deafness were challenging and sometimes frustrating. There were days I wanted to take him back. We all hung in there and he's become a member of the family and really has turned into a wonderful dog - we love him more than anything and can't imagine his not being with us.