I work hard to keep a nice lawn, but I always get something that effects the overall out come. this year I would like to get it right. I am posting a pic to see if any one would know what causes these spots in my yard. I water 5 times a week enough each time to fill tuna can. I fertilize with Scotts turf builder and I aerate with a spike aerator. Every fall I dethatch and scalp the lawn ( Bermuda Hybrid Sod ) all the way to the dirt almost. Last year I got these spots and then it took over the whole lawn and I my grass had huge brown spots in it. I also have a female lab that is neutered that loves to take a leak in the grass. I have a 50cut Craftsman Lawn tractor that I use in the summer and a 21cut walk behind mower that I use on the grass in the winter. I also over seed in the winter with a Perennial Rye grass. I live in Wickenburg Arizona and the elevation is about 2300 feet. Cool nights and Hot days in the summer! Can anyone HELP?