Welcome to YT!! I know its scary buying your first yorkie and want the find the best and healthiest pup you can. It sounds like you were a bit uneasy with what you saw..sounds like your warning flags were already up. Can you get the pup vet checked BEFORE you buy it? I have heard soooooooooo many horror stories of pups dying shortly after purchace that I think a good vet check is in order before you follow through with your purchace. Im not sure how it all works with breeders. I was wondering too why the parents are being kept outside in a shack? He is certainly a cutie pie and the parents are healthy looking...I am no expert by any stretch of the imagination..just try to be helpful
Dawn