How old is the oldest one? My shih tzu will put up with so much(she's almost 10), then she shows her teeth and growls to let them know to go on..she doesn't bite them though..I have to watch the 5 year old yorkie, she gets testy sometimes, but, when she does, I make the noise Cesar Milan makes and poke my fingers gently in to the side of her neck and give her "the look"...she gives me a dirty look back then lays down...
