Shoney had a broken tooth and needed a thorough teeth cleaning. Due to her old age the vet did a full exam with blood analysis, x-rays, etc. to make sure she could go under full anesthesia. At the end of the day she was very tired and didn't feel like eating or drinking. Today she's much better and still a little tired.
Yes. The vet likes to be sure the animal is well before dental work. Katniss needed to go through the same thing before they took out the rest of her broken tooth. Good Luck to Shoney!