logical consequences
ie, my four year old daughters cat is very tolerant and laid back luckily, but she knows if she wants to play with him she has to be very gentle and nice. She can put him in the baby carriage and cart him around, but if she picks him up too roughly or shouts, he'll be off and she's lost her playmate. Didn't take her long to learn that nice patting and nice talking will encourage him to stick around and play the game. Same with the dogs, my shepherd can be sat on, dragged around, dressed up, but if there's any sibling arguements, or anyone gets too rough, he'll come and sit with me and refuse to play anymore. Our other dog is 14 and both kids know all they're allowed to do with him is pat him gently, and if anyone tries to sit on him it will hurt him and they wont be allowed to play with him anymore. Animals can be a great way to teach kids how to behave with other people, as well as with animals.