My boy Banjo is only 5 months and already 10.4lbs. Hes as solid as a rock and full of beans. Hes a fast runner, and leaps up and down the stairs, flys off the sofa, jumps no problem on the bed. Just now have to train him to jump into the car ha ha. At first I was concerned about him being big. I was stuck witht he fact that he cannot be a "real" yorkie if hes over 7lbs. I am so glad now hes bigger, and that I have found out there are a lot more bigger yorkies out there.