It is funny you mention the thump, thump, thump. The cat does that also when he runs - he is the fatest kitten you have ever seen. He eats everything under the sun and I think he tried to eat that one time! When he was "small" the other cats would tolerate him pushing them away to eat and so did the dog. Now their survival instinct is kicking in. The dog tries to eat the cat when he tries to get her food and the other cats hiss and growl so they can get some food. The kitten looks ready to have a litter of kittens itself and sways back and forth when it walks (we know it isn't pregnant, he is a male).