Ok, I an in need of some serious advise. Do any of you believe a dog can have mental illness the same as people can? I have a 8 mo old neutered male. He is very lovable, loves people no matter what shape, size, color, sex etc.... He is not fearful of anything I have exposed him to so far. I have had him out in light, dark, rain, around fire trucks, different sirens vacum cleaners, you name it, nothing scares him. My guy loves cats, I have two. He also gets along great with my two Dachshunds. Here's the problem. He is an absolute psycho when it comes to other dogs. As soon as he makes eye contact, it's all over! Pounching, biting growling, pure aggression (really scarry). He has been in two obedience classes and always is the difficult one that has to be segregated from the others. He is very smart and usually is the best in his class as far as all the obedience commands go. I have had him with two trainers, one said he is purely dog aggressive, the other said he is fear aggressive. Both trainers have been able to get him to walk along side another dog after 10 minutes of psycho behavior that usually leads to pure exhaustion and foaming at the mouth. Evrything is fine as long as he is not able to make eye contact. Each time I feel we are making headway, that is until the next class and he is back at square one. I just don't understand the dog psychology of this. If he was really aggressive, would he love everyone but hate dogs?? Would he allow my two weiners to get into his bowl while he is eating and not even care? Is he mentally ill? By the way, he has been this way since we got him. The first time I witnessed this behavior he was only 10 weeks old. My one trainer said there is no way he could be exhibiting aggression at that young age, therefore he felt it was a fear thing. He has not gotten any better nor any worse, it's just much more difficult to control at 65 pounds. Should I just give up and accept that he will never be able to play nice with other dogs at parks etc... I do have a nice big backyard but I was really hoping to have a dog that could go anywhere with me and not be confined to his own property and limited to walks on restaint. I also have the fear of liability if he were to ever get out and come across another dog. I would feel just horrible if he were to hurt another dog. Any ideas or similar experiences?