Pricey haircut
Dr. Moo is just coming off an incredibly busy time owing to being the only person available to work in a five-person practice. She was on call 24 hours a day, every day, for two straight weeks. Every emergency was her responsibility. (As was every non-emergency.)
Unfortunately, not all the fahmahs in Vermont understand the meaning of the word "emergency." Like, for example, the older gentleman who called because the tail of one of his cows was brushing the ground.
In case you didn't know, cow tails have hair at the end of them. It's kind of like people hair. It can be cut without hurting the cow. So Dr. Moo drove out to the farm, got out her scissors, and served as a bovine beautician.
The true emergency revealed itself as Dr. Moo was getting ready to drive off. She was prevented from doing by the farmer, who leaned on her sideview mirror and talked about his health problems for 20 minutes.