We had Kirby's remaining teeth removed as well during the procedure. We also had him microchipped. He was 6 months and was 2lbs 12oz. He is now 13 mos and is 3lbs 3 oz. We are hoping he gets up to 4 pounds for healths sake, but whatever is natural to him of course will be. His parents were 7 lbs and 4 lbs.