Looking for a DOG TRAINER! Our family dog we rescued when he was a little baby just started acting up. He is very skidish and just recently he tried attacking my sisters 16 year old friend. We don't know why he is starting to act this way. He's great with so many people it's just only certain people he acts aggressive towards and it can be people he doesn't even know. He does greats with kids and wonderful with my one year old. He gets along with cats and dogs. It's just been scary lately that he tried to attack a young girl. He is part German Shepard and we're assuming the dad was chow. He is 3. We really need help to get him better. My mom would never take him to a pound but God forbid he bit someone it would be out of our hands. Thanks in advance!