Dog rocks are made from naturally occurring paramagnetic igneous rock. When placed in your dogs water bowl the end result is that your lovely lawn will look greener than before as using these natural rocks help prevent those nasty burn marks that dogs urine can cause. Dog Rocks being natural come in various sizes but have the same results, one pack will last for two months before they need replacing. Keep your lawn looking good by using Dog Rocks!  Product price is inclusive of VAT.