The yorkie standard says that weight must not exceed 7 pounds, while the Maltese is said to be under 7 pounds, so theoretically, the Maltese who weighs 7 pounds would be over standard while the yorkie who weighed 7 pounds would be within standard. You could conclude that this means that the yorkie is bigger, but that would be a poor conclusion. I'm not aware of any stats on average, and there is much variation within the breeds. Maltese standard:
American Maltese Association Yorkshire Terrier Standard.
Yorkshire Terrier Club of America Official Breed Standard. You got a bet riding on this?
