Cox Veterinary Laboratory products are fully guaranteed to meet your every expectation. We use these products on our own horses so we want them to work as well as you do. We offer a 100% satisfaction guarantee: If you are not COMPLETELY satisfied for any reason, we will gladly refund your money or replace the product. We only ask that you return the unused portion of product to us along with the original sales receipt so we can analyze the product for quality assurance.