Bitches are notorious for killing off lawns. As a long time owner of Border
Collie bitches, I gave up trying to find a remedy years ago. I now just let
the current incumbent get on with it, and sit outside wondering what my lawn
might have been without her. If you can keep up with your lovable pet,
watering the area immediately after the crime is the best solution.

On the serious side though, if you get a bitch spayed, you stand a very good
chance of solving the problem. Spayed bitches generally don't cause this
problem. But please note the use of the word GENERALLY!!! Once spayed, it
can go one of three ways:
1) Kills the grass as normal.
2) Has no effect whatsoever.
3) Acts as a fertiliser, and the grass on the spot grows like mad.
The end result all depends on the dog. You takes your chances!
For dogs (male) I don't think neutering makes any difference, though with
most dogs the problem doesn't exist.

One thing I will stress very strongly. If you get an additive for your dog's
diet, PLEASE check with your vet first as to what it's going to do to your
dog. Don't trust the sales staff at your local pet store. You need to
minimise the nitrogen content of the dog's wee, NOT change the acid content.
A lot of products alter the Ph content as well as the N level, and these can
be dangerous for your dog's health.

For more information and discussion on the matter, see:-

http://forums2.gardenweb.com/forums/...515119144.html
http://parents.berkeley.edu/advice/pets/dogurine.html
http://www.lawncare-business.com/How...Your-Lawn.html

jim, Northampton