In reading your post the first question I have is what is your son trying to gain in this? Living in the third density and lower mind we usually are motivated by something. He is 11 so he may not know why he pesters the dog. but I see a chain here something bothers him so he "lets it out" by bothering the dog and the dog "lets it out" and bothers the cat. I feel that the root is something unrelated to the dog. Is it something bothering your son at school? Is it him not feeling accepted by you or his dad? Just some suggestions. Much Love to You and your family!! Eddie