WELL I HAVE TWO YORKIES ONE IS A FEMALE PENNY WHEN I GOT HER AT 10 WEEKS SHE WAS 2.5 LBS AND NOW SHE'S 2 YEARS AND SHE IS 11 LBS THEY TOLD ME SHE WILL BE 7 POUNDS MAX THEY WERE REALLY WRONG. THEN I HAVE LUCKY WHEN HE WAS 9 WEEKS OLD HE WEIGHT 2 POUNDS AND HE IS TWO NOW AND IS PUSHING 5 POUNDS. SO CONFUSING TO FIGURE ANY OF THIS STUFF OUT I LOVE THEM BOTH BIG OR SMALL