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I have had him since he was 3 weeks because he had to be bottlefed.
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Wow! 3
weeks? In some states, it is illegal to sell pups before 8 weeks of age. Irrespective of when they are weaned, puppies need to be with their littermates until they are 8 weeks of age, and there is absolutely no reason in the world that you should have taken that puppy home at 3 weeks. I would report the "breeder" who allowed this, for sure.
To answer your original question, all puppies grow at different rates. What specifically, are you feeding him?
If the Vet says that he is healthy, I wouldn't worry too much..