Off topic, but I watch a programme called Animal Cops, its based in the states. They often get called to dig out pups which have been whelped under sheds etc. I've never seen a pup be aggressive they always go into submission mode. Wild kittens, as I know from experience, generally bite and scratch like crazy.
Both dogs and cats have been around man for a similar period? I guess, but cats are instinctively distrustful of man whilst dogs are just the opposite. Why?