When a young horse with balance problems arrives at the clinic, it turns out to be a challenging case for student Tanya Fief. The vets suspect a fungal infection may be the source of the horse's problems. Dr. Monique Mayer, one of the only veterinary radiation oncologists in Canada , attempts to treat a young dog who has developed cancer in her jaw. A black and white guinea pig named Oreo comes in for surgery on his badly swollen foot. A Golden Retriever has a suspect tumor in its parathyroid gland that needs to be removed.