Derrick visits a family in New Jersey to help two rescues: Angus, a cat with multiple amputations; and Lux, a dog who lost his front leg. Derrick's devices will help Lux and Angus keep up with their family.

In Lancaster, Pennsylvania, Derrick meets the Hicks family and builds a custom prosthesis for their dog, Millie, who was born with a front limb deformity.