Marvellous
I have two standard Poodles, a dog and a bitch, so not only burns on the law, but my shrubs suffer as well.
The Dog Rocks worked within a few days, never believing in "sell/use by dates", I found the burns reappearing after nearly four months and again disappeared after a few days of renewing them.
My dogs drink a lot of water from streams when we are out on daily walks and at home they have four water bowels, only one has the rocks in it, although I do leave the "used" ones in the others- I don't know what else to do with them!!
I have read a few negative reports, so I don't know if I am just lucky or whether the water is different where I live in Provence, France or the diet my dogs eat?
But they work for me, a fussy Brit expat who likes a green lawn!