Mine is 100% Yorkie (AKC Registered) and weighs 8.5 Pounds. He is not fat at all. I too wanted one around 5 pounds...but really 3.5 pounds is nothing. He's still small. He means so much to me..and I think he is perfect even though he is 1.5 pounds above Standard. His high weight is odd because his Mom is 6 pounds and his Dad was barely 4 pounds. Oh well...he is perfect to me.
