Peterals 400 Grams - Natural Mineral Rocks to Prevent Grass Burn Yellow Patches from Dog Urine100% NATURAL MINERALS: Peterals is an all natural solution to preventing grass burn patches created by your dog's urine. SAFE TO USE: The minerals are completely safe to use by both dogs and cats. TESTED: Peterals is known by many customers to be an effective way of preventing burn patches on both lawns and grass. EXTRA SAFETY: If your dog is likely to remove, chew or play with the Peterals minerals, simply place Peterals rocks into a jug of fresh