Dog Rocks. Stop Dog Pee Yellow Spot Urine Burns On Grass.... Naturally. DosageUSA & Canada = 1 x 0.4lb (200g) pack per 0.4 gallons of water.Metric = 200g per 2 litres of water Based on having 1 water bowl, this 600g pack should last you 6 months.If you need to divide the bag between more than 1 water bowl, ensure you have 200g minimum in 2 litres of water. 100% Natural 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. We reserve the right to send 3 x 200g should we run low of this product.