My cat and dog (from above) wrangle in the same way your two kittens do. Sometimes you see the dog chasing the cat, then a scuffle, a yelp, then the cat chasing the dog. The dog is far stronger than the cat, but the cat is sneaky. She'll attack from above and grab the dog in a headlock, throwing her to the ground. I really need some kind of camcorder for their antics.