Max the spaniel has suspected meningitis; some lardy Labs go head to head in a weight loss competition; and John comes face to face with some rebellious reptiles.
Cara the collie comes into the hospital suffering from breathing difficulties, and John meets Mischief the cat, whose thyroid problem requires a 'radioactive' solution.
Shadow, a black Labrador, has problems with his back legs that are causing great concern for his owners, while Dudley the pig's owners search for a solution to his overeating.