Pet urine is high in nitrogen. While the soil in your lawn may need nitrogen, too much of it will cause a burn. Texas A&M University points out that pet feces takes time to break down, but urine is absorbed into your lawn all at once. You can recognize burn spots in your lawn when you notice patches of yellow and brown grass. Creating and applying your own organic fertilizer will help you get rid of those unwanted pet spots.
Put on a pair of gardening gloves, and get out your bucket. If you don't have gardening gloves, you can use a pair of plastic or latex gloves.
Measure and pour your alfalfa meal, fish meal, greensand, gypsum and bone meal into your bucket.
Mix the ingredients to form your organic fertilizer.
Sprinkle the homemade fertilizer over the pet spots in your lawn.
Water the areas where you applied the fertilizer. The water will help the fertilizer seep down into the soil so that it can begin to work more quickly.