Dog Rocks. Stop Dog Pee Yellow Spot Urine Burns On Grass.... Naturally. DosageUSA & Canada = 1 0.4lb (200g) pack per 0.4 gallons of water.Metric = 200g per 2 litres of water This bundle will provide you with 8 month's worth of lawncare protection if you have 1 water bowl. Remember, you need 1 x 200g / 0.4lb pack in each water bowl with up to 2 litres of water (or 0.45 gallons). Usually a 200g/ 0.4lb pack is suitable for most average sized water bowls. 100% Natural How To Use:Dog Rocks placed in your dog’s water bowl are the only 100% natural and hassle free solution to urine burn marks on your lawn and shrubs. Safe for all household pets Safe for all household pets, Dog Rocks do not change the pH balance of the dog’s drinking water or urine; you are not medicating your dog in any way and there are no known side effects. Top Tip If your dog really doesn't like Dog Rocks in their water bowl (perfectly understandable!), put them in a jug/ pitcher of water and decant water from there.