James investigates why Honey the guinea pig is putting on weight. Cheryl goes on a home visit to do a doggy check-up on her four-legged family members. Plus the pressure is on for Rory to help a little dog with a big appetite for pebbles.

Cat the vet helps Winston, a hungry hound who's piling on the pounds. Rory goes back to school to check on some baby chicks. And James needs a steady hand to perform a very delicate procedure on Olly the rabbit.