When I was a kid, we had a terrific dog who was half border collie and half standard chihuahua (he looked like a short-legged border collie). We had him from the day he was born so I know he was never abused... and he would go freakin’ INSANE if a man with a hat came on the property. God knows what he thought the hat was. I’m just glad he wasn’t a pit bull.
I assume the dog is no longer around. If you ever get another with the same attitude, here is a suggestion for a gift you might get him.
http://www.amazon.com/Collection-Men-Without-Hats/dp/B000001J72