Fly repellent for horses, ponies and dogs and cats! Kills and repels 5 varieties of flies, mosquitoes, lice and gnats on horses and ponies. Kills and repels fleas and ticks on dogs and cats. Equisect contains and exclusive, botanically derived natural pyrethrin called Pyganic. Extracted from a species of chrysanthemum, it was specially developed for organic farming. Field studies have proven Equisect to be more effective than other leading natural fly sprays. Farnam offers 100% satisfaction with a manufacturer money back guarantee.