This premium formula has nearly twice the ingredients as its closest competition. Its weather proof feature binds to hair shafts to repel and protect animals from insects, rain, dust and dirt for up to 14 days. Use as a spray, wipe on, or roll on to kill and repel over 70 species of listed flying and crawling insects, on horses, ponies, foals, dogs and in and around premises. A most excellent and pleasant to use product. Will not harm harnesses.