mike Denver, CO 4/8/2010 7:27:37 PM My lab mix was always playful until he got out and was hit by a truck. After healing up he wanted to attack everyone outside of the family. Once he gets used to someone he is ok though. I went to a dog traiiner and he gave me a muzzle for him to wear when we go on walks so he would realize not everyone is a threat. I was also told not to pin him on the ground but when he jumps on someone to vertically pin him against a nearby wall. Both suggestions have worked well. When he is in the muzzle he knows he cannot bite and is very friendly with everyone. He is ok with the muzzle because when I put it on he gets a small piece of hot dog to reward him for being good.