What time do you go to the vet?
I'll be praying that you have the vet's support. This pup belongs with a loving mom. Maybe the vet knows of another small dog with pups right now that would be willing to foster the baby. I know it sounds crazy, but I also know things like this have happened before. Even cats caring for dogs and vice-versa lol
He needs some love. So glad you already know all about yorkies.
Let us know what happens
yorkiesmiles