Tucker was 2.5 pounds at 10 weeks and at almost 10 months old he is around 9 pounds and has been since he was 6/7 months old. He is still very small to me. I have a 4ish pound poodle and they are both the same height. (8 inches) He is very short, compact and solid as a rock. No fat what so ever. lol.. I dont worry so much about him as I do my poodle, even though they are the same height she is very dainty compared to him. He was only "suppose to be" around 4 pounds because his parents were only 4 pounds but Im happy that he is as heavy as he is. You will love your pup no matter how big he gets.
The bigger he is the more to love!!