All Natural Herbs for Coughing Horses Does your horse have a cough? Improve your horses lung condition and immunities with specially formulated herbs designed to improve the health of a coughing Horse. Silver Lining Herbs takes pride in the all natural approach to health in horses. This is what sets us apart from other supplement makers. First we start with 100% raw herbs that are regularly tested for purity to make the highest quality product possible. In addition, we meet all of the quality standard that earn us a NASC Quality Seal of approval. Equine veterinarians, rodeo champions and horse lovers recommend Silver Lining Herbs, try us and soon you will too.