Hill's Prescription Diet j/d helps your dog walk, run and jump more easily in few days. It helps improving your dog's mobility can be as easy as feeding the right nutrition.It is an excellent source of the Omega 3 fatty acid, EPA, to nourish cartilage. It is also Enriched with glucosamine and chondroitin sulfate and controlled calories and added L-carnitine for a healthy and highly palatable formula your dog will love.This product requires a veterinary prescription.