Answer: Without knowing what sod it was or the care it received, I can't say for sure. I'm assuming that the sod was Bermuda. Bermuda is a warm-season grass species that naturally goes dormant in winter if it wasn't overseeded with rye. Yellowing can also be caused by a variety of things, including over or underwatering, over or underfertilizing, and of course, dog urine. Try to separate each of these possibilities and adjust your treatment accordingly. An excellent resource for low desert lawn care is "Desert Landscaping for Beginners" by Arizona Master Gardener Press. It has a complete chapter on lawn care, including maintenance charts. The book is available at many local libraries or through the University of Arizona Cooperative Extension office in Phoenix. Good luck!
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