Pennyroyal contains a volatile oil in its leaves, which due to its strong minty aroma, has been used since Roman times to ward off insects and mites. During the middle ages it was laid on the floor and placed in the bedding to repel parasites. To gain the same benefits nowadays, we incorporate it into our shampoo where it acts to deter fleas and mites from our dogs and cats coats. It will leave the coat clean and fresh with a fresh minty tang and no sticky residue. Suitable for all coat types and for puppies and kittens over 8 weeks of age. This high quality shampoo is extremely economical to use as it may be diluted by up to 50% with water.