I need some ideas of how to deal with a problem that I am having with my 1 yr old Black Lab -- Jax. Over all he is such a good dog -- temperment,etc. He is wonderful around my three daughters (ages 14 to 3). He is never aggressive with other dogs, socializes very well... Here is my issue -- Our neighbor behind us has 4 dogs -- 3 Chichuahuas and 1 Boston Terrior. If anyone is in our back yard, these dogs bark the whole time at the fence, have tried to dig holes to come through the fence,etc...very aggressive behavior. When we got Jax initially, he ignored the dogs behind us. Lately though, his behavior has changed. Now anytime one of us is out in the backyard with him, he will run up to us greet us,play and then run to the back of our fence and stare (Head up, chest out, tail in upward position) into the other dogs backyard to see if they are back there. He runs back and forth the whole time anyone is in the backyard, almost "doing rounds" to make sure those dogs aren't there. If the dogs happen to come out to thier backyward, then watch out. His behavior changes -- hair on the back is raised, very tall posture, actually bites and chews at the wooden fence and the chicken wire we put up -- like he is trying to break throught the fence. He barks very deep -- foams alittle at the mouth and will not repsond to ANY verbal commands. Tonight he was so upset the he bite the fence hard enough to cut the side of his mouth. I have watched him when he is the backyard by himself and the other dogs are barking at him. He completely ignores them, sometimes even laying down and going to sleep on our deck..He doesn't even give them a second glance. My question is why is he doing this? It seems so out of his character. He does this with only these dogs. He has never been with these dogs without the fence between them. He doesn't do this at all with the other neighbors that have dogs that live on wither side of us... Any suggestions or insights into his behavior is appreciated.