8-in-1 Formula & the #1 Dog Electrolyte and Joint Supplement. Dehydration related to heat stress is one of the most common preventable causes of death in dogs. Petralyte Dog Electrolyte and Joint Supplement is made with premium, natural ingredients that support physical performance and recovery for dogs of all ages, breeds, and sizes.Petralyte drastically improves the speed and efficiency of water absorption, helping dogs to stay hydrated and healthy. Canines need electrolytes and nutrients just like humans do, especially before, during, and after exercise, on hot weather days, and when recovering from illness. Supplements include Glucosamine, Chondroitin, and MSM for Mobility & Joints, Taurine for Muscle, Heart, & Vision, plus L-Glutamine, Galactooligosaccharides, Oligofructose, and Inulin for Intestines & Gut.Simply add Petralyte to wet / dry food OR 8oz of water and mix thoroughly for your pup to receive instant benefits.