Sunita and her fellow volunteers at the Wild at Heart veterinary clinic become involved in efforts to save a bunch of feral and abandoned cats with the help of Dr. Mac.

Brenna, one of the volunteers at the Dr. Mac's Place animal clinic, is horrified to find a dog caught in a trap in the local nature preserve, but subsequent events prove that every story has two sides.

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?

After treating an injured greyhound at her grandmother's veterinary clinic, thirteen-year-old Maggie learns about the abuse of greyhounds in the dog-racing industry and vows to put a stop to it.

"Meet Jules and Josh, the new twins in town! While Josh adapts quickly to Ambler, Jules accidentally makes an enemy of Maggie. Hoping a pet will help her feel better, Jules adopts the class rabbit, Chewie, but things go downhill when there are complications with Chewie's spay surgery. With Dr. Mac out on a call, it's up to Jules to work with Maggie to help the rabbit - and maybe even prove that she and Josh are worthy of becoming Vet Volunteers."--...

When Sunita joins Dr. Gabe on a house call at a local horse farm, she finds a lonely lamb in one of the stalls, reminding her of her own loneliness as her friends seem to be moving on without her.