I think it could be a throw back. One of my boys, his parents were mini's and he's up to 20 pounds. He's not fat at all, just muscle and built like a mack truck. I can look down and see a slim waistline. He's just a big boy.My new little girl isn't so little. At 8 weeks, when she came home, she was 3.4 lbs. At 8 months, she is 17 lbs. She was sold to me as a mini. The breeder said that the parents were 10 and 11 lbs. My questions is, is it even possible for miniatures to produce a standard?