3.5# OUTLAST EQUINE TREAT - Show your horses (and their bellies!) some love with Purina® Outlast® Horse Treats! They contain the Outlast® Gastric Support Supplement that helps support optimal gastric pH. Researched at the Purina Animal Nutrition Center, these treats are a perfect complement to any horse’s diet. Your horse will love the great taste, and you will feel great knowing you are helping support their gastric health.