<human>: Hello all,
I realize it is probably too late to truely remedy this issue, but I'm just looking for some insight on the situation. My Aussie-Collie has always been an aggressive dog, constantly picking fights with neighbor dogs, occasionally attacking people walking down the street. If he familiarizes himself with someone, he's usually fine around them, but sometimes he'll just go insane at someone he was perfectly friendly with 30 minutes ago. We bought him as a puppy from a ranch where his parents were active herding dogs, so it's possible his working heritage has made him not as "domestic" (for lack of a better word) as other dogs. Just wondering if this is a common problem or if my dog is just insane. Thanks for taking the time to read this.

Can you give me the gist of the text in a nutshell?
<bot>: 6y/o Aussie Collie from herding background has aggression issues , attacks neighbors/dogs with no provocation.