Dog Rocks 200g Stops Lawn Burn Patches and Fertilizes your Lawn It's very simple – Dog Rocks stop pet urine ruining your lawn, grass, shrubs and hedging. Dog Rocks are 100% natural, proven & hassle free prevention & cure to canine grass burn patches. No medication required, safe for all breeds of dogs and any other pet you share your household with. After using the Dog Rocks for 5 weeks, you will start to notice a change in your lawns appearance, new lawn burn patches should not appear. If your dog regularly eats rock, place Dog Rocks in a jug or pitcher of water and decant water from the jug to the water bowl.