My yorkie (almost 3yrs old) is 10.5lbs and my maltese (9months) is 3.5lbs, and they get along great. He's much bigger than she is, as she has a very tiny frame, and he has a larger frame. They both love to play with each other and he is very gentle with her. They chase each other and both run after the ball when we throw it, but he always lets her get it
