No, it isn't necessary, particularly because he isn't having any symptoms.
However, I personally would have a hard time putting a Yorkie under anesthesia without one because the vet wouldn't know to alter the protocol. There can be a problem even with no symptoms and no elevated enzymes, so the only reason not to do one is really money.
__________________ Crystal  , Ellie May (RIP)  , Rylee Finnegan  , and Gracie Boo🐶 |