Although in most cases of aggressiveness, it comes from something "someone" has caused with the dog or puppy, there are other things. I have a dear friend who had to euthanize her Golden Retriever. I won't go into the long story here, but he had something going on in his brain. She spent thousands and thousands of dollars having him tested, going to specialists, etc. There were certain things that would set him off. She had him since he was 6 weeks old. She never learned the source of his fears other than the fact that they called it "Rage Syndrome". He bit unexpectedly and quite often, I later learned. It was the last bite that did it, and it was my friend who was the victim everytime. She ended up with multiple wounds on her hand and arms the last time, he severed an artery. He severed a nerve, and she still doesn't have the use of one of her fingers.

The point of all of this is that it isn't always the owner, and that even the breed of dog that you would least expect it from can have an uncurable problem.

Would I condone shooting a dog? NEVER!