My yorkie is 3 yrs old and weighs 3 lbs. He does not look thin at all.Maybe your pup is longer or taller ? My yorkie puppy eats the Eukanuba puppy bites and is doing well on it now. If you ask what the best food for your yorkie ,you will get at least 10 different brands and those pet owners will assure you that this one or that one is the very best. I know there are plenty of dogfoods that you can read the label and it's all awful just awful ingredients.It could deffinately be that he has thin hair and you see his legs with little hair. I had a female yorkie who had little hair and her legs looked like two pencils
The vet said she was at a normal weight for her age and size...
Genie,Cookie,Lola & Angel