[[https://www.amazon.co.uk/Dog-Rocks-Urine-Patch-Preventer/dp/B000NE2UH4/ref=sr_1_2?ie=UTF8&qid=1474146212&sr=8-2&keywords=dog+rocks This kind of thing]] We've had some for a few weeks and I ^think^ that we have less yellow patches on the grass. But I'm not sure [confused] Anybody else's experiences much appreciated.