by exoticisabella » Nov 25, 2009 I have a question for you...My baby rottie (well, he''s a year old now) seems so skinny! We feed him six to eight cups a day of high quality dog food (no corn, wheat, etc fillers) yet he doesn''t seem to be putting on muscle bulk - though he has grown taller/bigger. We bought him from a very reputable breeder and both the breeder and vet have said not to worry about it that he must just have a fast metabolism. He seems happy and healthy, but I just worry about his skinnyness. What do you feed your dog and how much? Anybody else ever have this issue? eta: and he has been checked for worms, etc.