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Originally posted by dustino8
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I could just cut out the damaged grass and replace it, but ...
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You'll be doing that constantly. It takes weeks to restore a patch, but the dog has to pee 3-4 times a day. The best solution is to train her to go in the same place, preferably in a remote corner of the yard, and just "write the area off". I have female dogs and I've given up on making the lawn in the backyard a "showplace" like my front lawn. I manage to keep it at bay with a low nitrogen fertilizer and huge amounts of lime, which reduces the acidity.
It's the ammonia in their urine that burns the grass, but also is metabolized by the grass as nitrogen; that's why you get donuts of thicker grass around the burnt spot where it dissipates enough to be metabolized (perhaps a crude form of ammonium nitrate, i.e., fertilizer). Some of my dogs have caused this problem more than others and I don't know why (same food); guess it's just body chemistry.