Dog Rocks are the original solution to dog urine burn in your garden. They filter out impurities from water such as tin, ammonia and nitrates. The only 100% safe and natural product of its kind, Dog Rocks stop dog urine burn from ruining your lawn, grass and hedges.   How to use Dog Rocks Remove your Dog Rocks from the packet and rinse them under water. Place your Dog Rocks in your dog’s water bowl then fill the bowl with water. Leave the rocks in the water for 8 hours. For best results top the water at night before bed. Replace your Dog Rocks after 2 months of use. Dog Rocks work best when used alongside a premium dog food.