3 pds isnt big for a 4 month old puppy, why do you think its BIG.. my puppy is 5 pds now and she weighed in at 2.7 at her 12 week check up.. I think I am confused because just last week you said he was sooo tiny nothing fit him.
And honestly since you bought him off the internet how do you really know what his parents weights were? If I remember correctly they told you that Cobys brother was posted on the website but they had completly different birthdates , so I dont think you should trust them.. Looking at Cobys pictures he does not look over weight one bit , he looks just right!! I see an excellent vet and they told me to free feed my puppy till she was 10 months old.. And if you have a petsmart near you they have nuracal for 8 dollars a tube.. Im pretty sure there is one near you in Walpole