Yesterday I went out and bid on a residential. The property is 1/3 acre. The question I have is that on the south side of the house the grass is as yellow as straw. The area in question is about 1500 square feet in the open. It doesn't look like snow mold nor does it look like thatch, it's only 3 1/2 to 4 inches high. They have a small dog but it doesn't go on that side. I have a dog and now what urine stains look like.When I rake my hand across it, it comes loose but not like it would if it had been infested with grubs. What could have caused this? The rest of the lawn is truning green. I don't have pics, if I get the property I will take some and post it. I did do a search on this and found nothing that relates to my question.