It's not off topic and I'm not uptight? I just intend to persue a career in canine behaviour so have a very strong interest in this field, you seem to know of others who are researching in the same area but refuse to give their names so I can't expand my knowledge.
I'm not entirely sure why you even initially responded to me. All I did was post about prey drive based behaviours, which chasing moving objects is, and explained it and you seemed to somehow disagree with my definitions and explanations of prey drive... Which I find odd as there isn't a single behaviourist out there that I know of that will disagree with the 7 parts in the sequence I posted.
I never even said the dog attacked the snake as a result of prey drive. I simply explained what prey drive is as a possible explanation.
ETA: Actually, I see i did not include the word "usually", my apoligies. I do not believe the dog in question was defending it's pack though. Dogs don't know what snakes are unless they learn this through past experiences or training causes an aggressive response.