Harry will be 2 in April & is a lean lad, a breeder who saw him when he was 10 months said he'd be 2 or 3 before he filled out so I shouldn't worry. I have been feeding Harry tripe as one of his daily meals & weighed him recently & he's put a kg on since last weighed in June, he's now 11.7kg the same as Max, who is a much stockier boy & not as long bodied or tall as Harry though. I think he might still fill out a bit more yet. He has heaps of energy & of course the vet said he was perfect when he weighed 10.8kg