From angry bulls to feisty calves, the animals of Isabella County are getting testy after a long cold winter. The farm calls keep pouring in, but when a cat with a birthing injury is brought into the clinic, Dr. Pol and Charles are inspired to volunteer for the local Humane Animal Treatment Society to help control feral cat overpopulation. Charles joins members of HATS and Isabella County Animal Control on a stake out to capture and neuter a growing family of junkyard feral cats. Meanwhile, Dr. Brenda does some intensive detective work on a pooch with a mysterious growth in its neck.