Urine is just a highly concentrated form of nitrogen. If anything, it should encourage established or mature trees to put on additional growth. Young trees or saplings area different matter - the nitrogen is too strong and can burn but this is not an issue with any larger, better established plants. Most dog parks in my area (and I visit a lot of them frequently) cover the trails and main socializing area with bark or wood chips, similar to what one would do in a home kennel or dogrun. These absorb much of the liquid waste and are changed out or replaced when they become too soiled - leaching into groundwater or streams/lakes is not an issue. Solid waste must of course be bagged and properly disposed of.

I've read that females tend to cause more turf problems. The composition of the urine is somehow more destructive and because they squat, the urine is concentrated tightly in one spot. I think it was my post you were referring to. I have a TTTF lawn with some remaining other fine fescues that preceded my TTTF overseeding. My 7 month old TTTF doesn't seem to be harmed by the pee now and instead just gets a big flush of top growth. Right now nothing at all is growing in the burned spots, which are about 2-3 inches in diameter.

Problem 1 : The urine odor. Try saturating the smelly spots with Natures Miracle or Odoban. Let air dry (keep windows open day and night), then have the rug professionally shampooed. Chem Dry comes to mind. Good luck. Problem 2. Regarding the behavior of the Nanny. My daughter is a self-employed nanny. She has plenty of customers because she is darn good and kids love her (and she loves them) . She is reliable, always on time, will clean up a little, make meals and feed kids, changes diapers, has her own transportation (Mom and Dad keep her car running, but she buys her own gas). Anyway, my daughter would never, ever have a pet. She owns a cat that lives with us (Mom and Dad). She had an apartment for a while but her cat remained with us. So, allowing a Nanny to even have a pet is OUT. Tell your sister to be very careful in her next hire. And my daughter's in New York, and not willing to re-locate, so I guess she's out.

Morpheus informed you earlier that, "The Milo will help, but it'll take more of an organic base to stop the dog burns. Usually you need enough carbon in the soil (and soil life living on said carbon) to fix and immobilize the nitrogen from the dog pee. And there's a lot of nitrogen in pee." It takes time, frequent feedings of organics (grains such as corn, soybean, alfalfa, etc.), and constant mulch mowing (both grass and leaves) in order to establish a higher organic base. Four applications of milorganite is definitely not enough.