Aha! Those ugly brown spots… Well, the answer is … there is no answer. The problem is that all urine contains ammonia, which kills grass and just about all living things.
If you have ever tried to house a goldfish in a bowl without filtration you know that if you don’t change the water regularly after a while you’ll find your fish at the surface gasping for air and a few days later floating belly up. The cause is the ammonia from his own waste and uneaten food.
Yes, watering the lawn does help but it’s not a cure.
If you can’t build him his own run where he can piddle to his hearts content. (see Dog Doors and Kennel Runs
http://www.suite101.com/article.cfm/livi... You might want to try picking an area for him to use and cover it with stone. Take a few paper towels soaked with his urine and place them under the stone. Then when ever possible take him out on a leash to his special area and praise him when he goes there. Now… the trick is to keep him off the lawn. There is a product on the market called; Scarecrow
http://www.mountainvalleygrowers.com/sca...
It works using a motion detector and a sprinkler. Every time your dog passes that area, he’ll get squirted.
Now this may not work with all dogs especially with water dogs such as Labs. He may find it great fun to make the system squirt him and some dogs may attack it. But, it’s worth a try.
maybe lime would do more damage to your grass??? seeing as lime burns