We put new sod (tall fescue I believe) in april because 1/2 of the yard was dirt! The side that was terrible beforehand has become wispy with tons of dead spots everywhere. That side of the yard does not get very much sunlight and I have tried to limit the amount of water that goes on that side in order to not overwater. There are a few spots on the other side as well but not a major concern. About a month after we initially laid the sod, I went through and patched a number of spots throughout the lawn that were dead or totally dying. We also have a dog but we tried to keep him off the lawn while it was in the initial stages and in addition he always has his first pee of the day(the most potent) on the other side of the house. I have looked at dog urine burns and it does not look like my situation. If needed I can post some pictures and answer any questions. Thanks!