[Bruce's_Mom]

For oh 95% of his life Bruce was a happy go lucky pup, who was well socialized and loved to play with other dogs in my opinion at least. He completed puppy socialization class, basic obedience, and attended day care daily and played happily with the other pups...Well after this last (and hopefully final surgery) he went through a period of isolation (meaning no pup play time, I still spend a ton of time with him), and has been exhibiting aggressive tendencies, or actually what I would consider extremely aggressive behavior...

He barks uncontrollably at all other dogs, but is worse with big dogs. He has snarled, growled and tried to attack other dogs, including dogs he has been around and played with his whole life. He barks at people more, especially cyclists and joggers, and tonight while walking him appeared like he was going to lunge at one. This is all worse while on leash or when held, and with me and people he knows he acts sweet as can be.

I have tried many methods to help this, currently I am even paying a private trainer, but nothing seems to be helping. If this continues Bruce will not get to play with pals or anything and will be miserable. Is there anything that anyone can suggest?