A puppy trader has been selling sick puppies to unsuspecting pet-lovers. Dom and Melinda meet two families left broken-hearted after their new puppies died days after purchase. The team goes undercover to expose the seller and ends up rescuing two dangerously ill puppies in the process. While Melinda attempts to get them nursed back to health and rehomed, Dom meets an ex-employee who is keen to blow the lid on the whole operation.