It's intern vet Whitney's busiest day yet when she works with Dr. Charlene and Dr. Chris to remove tumours on two rescued grey wolves. Heather helps C-Jae with health checkups on nine rescued polar bears while the rest of the team attempt a tricky hoof trim on a reindeer with dangerous antlers. 

Onyx, the only female in Assiniboine Park Conservancy's pack of rescued wolves has a mass on her mammary gland; Dr. Chris and the vet team must rush to remove it.