when i got dexter at 12 - 13 weeks he was 1.8 pounds and stayed that way for about a month...at 3 months he grew and grew and grew...and still continues! lol. his last vet visit he was 3.5 pounds, but im pretty sure he is at least 4.5 - 5 pounds now. there are other pups here the same age as dexter that havent grown as much though...every pup is different!