We have a large lab x Rottie and we have the burnt grass from wee problem, we now follow her if we know she's going to weekend drown it with with water, it does mean that you have to be vigalent. What no 1else has mentioned is that we also get foxes in our large garden overnight and they wee in patches that our dog hasn't weed on. We proved this twice this year as more patches appeared whilst we were away, big patches to.
so that even more exasperating as we have no control over that!
as to repairing patches we with a hand fork scratch out the dead grass take out a small amount of soil (this is when you know it's a fox the ammonia smell makes you choke) jab the fork in 2cm put a scattering of grass seed over and rub it in and around then put a hand full of patch fix over then some compost, this will grow brilliantly an very lush.
im still wondering about trying green pees...is it still worth it when families of foxes are always around!?
when our dog visits our friends or my daughters she wee's there but doesn't leave brown patches, can anyone explain that!!