LOL Casper and Kitty! That would have been hilarious to see!!

Yeah, doggies are just doing what comes natural because of their wolf instincts. Wolves do this to mark their territory boundaries. They do it often to make sure other wolves do not invade their pack's territory. Maybe if the dog is peeing in the yard that is it's territory.......but I don't think the entire neighborhood is! lol.

I'm sure Nebo will do it, he has dominance issues. Last night he was playing with a milkbone ball, trying to get the treats out. Smokey came over to sniff it, and Nebo went for him! It scared me, but luckily nobody got hurt! I always feed him outside, because he is very protective of his food bowl. Not with people, just dogs. He is fine if I pet him, take it away, or hand feed it to him.