I found this on a website - dont know how useful or correct it is but i thought as there are a few posts on here about this subject i thought it may help!
Subject: My dog's urine is killing my grass
Answer:
You have a dog, he pees, his pee is high in ammonia....pure nitrogen,
and concentrated the way it is on your lawn, much like too much
fertilizer, can burn the area.
So, where he goes more often, you water more often.
Sprinkle some lime in the area. Lime is good for lawns. Its alkalinity
will reduce the effects of the acidness of the pee.
Or sprinkle some gypsum...powdered gypsum...will also act like lime.
No lime...no gypsum....then use baking soda, sprinled on the surface
will act much the same way.
*****
You could alter the pH of your dogs urine by adding a teaspoonful of
Brewers Yeast to his/her diet. That is something already in most dog
foods, just not enough.
For brown spots already in the lawn a 50/50 mixture of gypsum and lime
does help correct the two problems dog urine creates, excess nitrogen
and uric acid, but it is best to water down the area as quickly as
possible afterwards to dilute the urine as musc as possible.
*****
There is a product out that comes in the form of a treat and saves
your lawn while treating your pet. It is available at Pet Supplies
Plus. It is called Turf Saver by Harper's and is 100% natural. Only
chemical is a preservative. So far it has worked great for me, and I
have 2 medium sized dogs and 2 puppies. I forgot to get some one week
and immediately noticed a few burns so I believe it does work.
*****
If you read the labels of those products you will find that they are
brewers yeast, only they cost much more.
