If pup is not gaining i'd be concerned about a possible parasite load. If no worms and still a concern of a yorkie not gaing then I'd look at the liver.
How often are these pups dewormed and/or had fecals? Is breeder getting dewormer from a vet or ovr the counter?
__________________ Crystal  , Ellie May (RIP)  , Rylee Finnegan  , and Gracie Boo🐶 |