Description Equerry's combines probiotics and electrolytes for your horse in this convenient, easy to administer paste. Perfect for taking to horse shows, when traveling or for use after a hard ride or schooling session. Sometimes you just have to ride, even if the weather is hot and miserable, and a little prevention goes a long way to help your horse stay healthy. Electro-Probiotic Paste from Equerry's keeps your horse hydrated and helps ensure gut health and movement during times of stress.