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!
When I first heard about these rocks I must admit I was intrigued as to how or if they would work as they are not particularly cheap for basically what looks like 'garden' rocks!
But I have to say, get them they are amazing!! its true they dont cure the already 'scorched'patches on the lawn but they definitely help prevent any further scorching therefore leaving your lawn to recover.
Don't ask me how they work... they just do!