After Sunita's beloved pet cat, Mittens, gets injured on her watch, she wonders if vet work is right for her. She takes an internship at a research lab, but learns that they test on animals and eventually put them to sleep. Sunita loves animals, but can she find a way to work with them without harming them?

Jules and Josh are so excited when their parents hire ponies to attract customers to their sidewalk sale. But the Vet Volunteers notice that the ponies don't seem to be very healthy, and after an examination, they learn that the handler, Gus, has been mistreating them. Can the Vet Volunteers help the ponies get well and find a better life for them?