According to their national breed club, Yorkies should be about 7-8 inches (17-20cm) at the shoulder and weigh 3-7 lbs (1.4 - 3.2 Kg). But some individuals are smaller, and many are quite a bit larger. Let me ask you: Have you heard of a Teacup Yorkie? a Tiny Toy Yorkie? an Extreme Tiny Yorkie?