DOG ROCKSa are a new and exciting product used to help prevent those nasty burn patches appearing on your lawn when your loving pet takes a pee.By simply placing contents of DOG ROCKSa packet into your petOs water bowl and filling it with no more than 2 litres of water your lawns will start to look greener and fresher. DOG ROCKSa hold special properties that helps your loving pet fertilize your lawn, not destroy it. DOG ROCKSa have been laboratory tested and are safe for your pets.PRODUCT DETAILS D Paramagnetic Igneous Rock DOG ROCKSa increase the properties of Boron, Barium, Manganese and Strontium while decreasing Tin levels in the water. Place contents of Dog Rock packet in up to 2 litre of water in your dogOs bowl.For best results D DOG ROCKS need to be replaced every 2 months to ensure your pet does his job in helping look after your green grass. As Dog Rocks are a natural product, they will vary in size.