I have a 2 year old rescue, I think he's a Chihuahua Terrier mix. He's generally super sweet, but can be aggressive. He is very aggressive towards other dogs, whenever he sees one he goes crazy, barking, jumping, lungeing at them. Even though he only weighs 8 lbs, I have trouble controlling him when he goes crazy. He also always barks when people come close to my front door. He seems to be afraid of legs as well. If feet/legs get too close he growls, and bites the legs. I'm at a lose of what to do, we've been in training but I would say it's not helping at all. He can sit and leave it but when there's another dog or he feels threatened all bets are off and he become Cujo.