[JavaBrewer]

I was in the same boat with our GSD a couple years back. We did everything we could, a K9 trainer, a dog trainer (owners get the training actually), dog parks, socializing, etc... One day I was throwing the ball with him out front (off leash) and he attacked and nearly killed a small dog being walked by a neighbor. The final straw was the afternoon I saw him pacing our backyard fence with his hackles up and a low growl as the neighbors kids were playing.

C-ya.

I would never forgive myself knowing my dog had aggressive traits and and he eventually hurt somebody. This was a male GSD, neutered, socialized, etc... He was very Alpha and I strongly believe you just can't train that behavior out of the dog. Sure they may tow the line when you're around but what about the other times? I get that folks love their pets but people come first.