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Why is my dog's urine suddenly burning yellow spots on the grass?

Updated on September 23rd, 2025

Pet's info: Dog | Mixed Breed Small (up to 22lb) | Male | neutered | 22 lbs

for 6 yrs we never had yellow spots in yard from our dog now all of a sudden we do --whats happened--why now

1 Answer

Most Helpful Answer

Dr. Strydom, DVM

Answered By Dr. Strydom, DVM

Veterinarian

Published on July 21st, 2017

The yellow spots are actually burned grass. This happens when there is high nitrogen content in the urine and/or grass.

While nitrogen is an essential component in healthy soil, high concentrations of it can cause grass to turn yellow or brown. Urine is naturally high in nitrogen and alone can cause grass burns. Lawn fertilizer also contains nitrogen. An excess of either or a combination of urine and fertilizer may result in an overdose of nitrogen, thus "burning" the grass.

Salts and other compounds in dog urine can also contribute to grass burn. In addition, highly acidic or alkaline urine may alter pH of the soil in that area of your yard, adversely affecting the grass there.

So, my guess is that it is happening more now because some change in nitrogen content in the soil in the yard.

You can give your dog a supplement or food additive that is designed to neutralize the nitrogen in the urine. One example of this type of product is Naturvet Grass Saver that you can buy on Amazon. You should consult with your vet before starting any supplement. Additionally, never attempt to alter your dog's urine pH unless specifically recommended by your vet.

Immediately after your dog urinates you can use a garden hose to rinse off the area thus diluting the nitrogen content.

You should also consider switching to a low-nitrogen fertilizer for your lawn (make sure it's pet-safe too).

I hope this helps. Best wishes!
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