I adopted Mac when he was about 5 years old. I have had him 3 years. He is very aggressive with other dogs when on leash, but does well off leash. It takes him a while to warm up to another dog, for example he bites my daughter's puppy daily. He is aggressive with my teen age son, but it is like a game and I can't control either of them. He needs an owner who can work with him and train him. He is very smart and does some tricks. He will escape out the front door any chance he gets and does not come when called. I am scared he will hurt someone pet when he takes off. I am his person and I love this dog but know I am not providing him with his best life because I don't know how to work with him.