I've got a cat who likes to do practical jokes. My dog often likes to harass the cat, jumping on him, licking him, etc. When we catch the dog at it, we yell at him. The cat gets bored, so he walks over to the dog. The dog looks at him but is being well behaved. The cat bats the dog with a paw, the dog turns and starts harassing the cat, we yell at the dog, the cat is happy.