I have to tell you the story about my Wynstn, His Dad weighs 3lbs and his mother weighs 6lbs. My "Wynni" weighs, at 2 years old 12lbs! I thought he would be small so I bought all of this small stuff for him. We love him so much and yes we can play rough with him, he loves that. His favorite thing to do is playing with a soccer ball all over the back yard then jumping in his pool to cool off then back to the ball. I don't think a smaller dog would be able to push the ball all over the back yard like he does. My other Yorkie is 14 yrs old and he weighs about 8lbs. I do want to some day get me a little girl so I can dress her up! All Yorkies, not matter what size are great, they are just like people come in all shapes and sizes.