[header] How to repair spots from pet urine in lawn grass [title] Identify spots caused by animal urine. [step] Dead spots in your lawn caused by animal urine will be round, and generally all in a single area of your yard. The individual spots may range in diameter from a few inches to over a foot. 
Dogs especially tend to habitually urinate in a single area. [substeps] Animal urine is not the only agent that can cause lawn damage and dead, brown spots of grass.