I don't think you can Joyhowitt a way of stopping it is to give the fresh urine a good watering if you see her doing it, the only other way is scratch out the affected parts and put a bit of seed down and and sprinkle with compost, Roy.

Hi, the best way, if it's your dog, is not allow it on the lawn in the first place, if it isn't your dog, then you need to find a way of keeping it out of your garden, all you can do to get rid of it, is as above, Derek.

As Roy has said, dilute said urine with copious amounts of water immediately after the dog's been. Other than that, as Derek has said, keep your dog off.