What are Dog Rocks? Dog Rocks are a 100% natural and safe Australian product that helps save your lawn from burn patches caused by dogs when they urinate on your grass. They filter out impurities in water, such as tin, ammonia, and nitrates. Dog Rocks have absolutely no harmful side effects to dogs, and even if your dog shares his bowl with the cat, it is fine for your cat to drink this water too. There is no change to the pH balance to either of your pets urine. The impurities are generally passed out through urine, and when they come in contact with grass, it results in grass burn; a dead yellow patch of grass. Dog Rocks make the water source cleaner for your pet and eliminate grass burn. Water without impurities from Dog Rocks will actually help your pet to fertilize your lawn. Your grass will start looking greener and fresher in no time at all. Dog Rocks are a naturally mined product so the rock sizes differ from pack to pack, but the weight of each pack is always consistent. There are usually 1-3 rocks per pack. One pack of Dog Rocks will last you two months. Please note: All the rocks from one pack need to be added to one water bowl. It is important to make sure that your pet drinks solely from this source of water, as any other water that they drink will not have been filtered by Dog Rocks, and will therefore reduce the benefit of Dog Rocks. Top off the existing water in the bowl every day rather than replace the water. Change the water when the dog is least likely to consume large amounts of water.