Question
Where my dogs (bitches)urinate on the lawn the
grass dies and a circle of dark green lush grass
grows up around the outside. How can I treat this?
I am told that the ph needs to be adjusted.
What can I use to cure this problem.

Answer
Hi Roger,

Adusting the pH of the soil will not fix this very common problem.

The dog's urine contains nitrogenous compounds that are fertilizing the spot, so this makes for the green ring-effect at the edges and the concentrated saltiness kills the central area. The salty urine 'burns' the foliage, so it dies from the hypertonic effects or urea.

If you are able to simply hose down the areas before the urea can burn the grass foliage or have its concentrated effects in the top soil, it is actually a good fertilizer and if the rest of the yard is well fertilized, you will not see any negative effects or spotting.

 If the dog is kept away from a urine damaged area, time, rain and watering will fix it as all the microbes in the root-zone work to bio-degrade the urine/salts and re-establish a normal soil ecology.

There are reports that Urine on the lawn can be neutralized with about a cup of gypsum.  I have found no testimonials or technical studies-research as to the validity of this, however. And I know of no scientifically tested urea-canceling chemicals you can use.  There are sprays you can find at pet centers which supposedly attract dogs to a specific area so spottings due to salting effects are less of a problem. Some people have good results training especially the younger dogs to use certain areas to relieve themselves.

 Some people believe they can add herbs, baking soda and other chemicals to their pet's drinking water to help with lawn spotting. Please Do NOT add anything to your pet's drinking water unless such action is under a veterinarian's supervision! Adding chemicals to the water will NOT affect urea production by the animal's kidneys and may in fact cause an illness or a toxic condition for your pet.

  If the dog persistently urinates in a small area, the soil can become irreversibly too salty for almost any plants or grasses to grow. With this you will have to under till the top soil or, better still, replace it with fresh top soil or potting soil/compost (cheap and available in bagged form at many garden and department stores).

So, encourage or train your dog to go where you prefer with attractant sprays and rewards, or else keep the spots immediately flushed with diluting water are the best remedies for your lawn spotting problem.


 Although there are NO PET-PROOF GRASSES available, some grasses are considerably better than others for a dog's domain. The best lawns for dogs are those grasses that spread by either stolons or rhizomes (usually these are for warm climates). In southern climates, Improved HYBRID BERMUDA Grass cultivars,(example: "Savannah"), are excellent choices for dog lawns. Aggressive lateral growth habit during the warmer months of the year will help to heal damaged areas. During the early Fall, you may consider over seeding these lawns with  perennial rye grasses (Lolium specie) for improved durability during the cooler months.  Tall Fescues are also more resistant to hypertonic effects than other grasses.  Tall Fescue can be grown in all parts of the USA. Mixing Bermuda with Fescue/Rye may also be a compromise for dog spotting in Northern States; the Bermuda will become blanched and dormant in the cold weather, while the Fescue or Rye will stay green.  Remember these grasses are not absolutely urea resistant...just more so than other grass choices and may be worth a try for you.

 Confining a large dog to a kennel run to keep it off the lawn is another way to prevent lawn spotting; this, however, is a sad choice and one which may give you a spot free lawn but a very bored and unhappy dog.

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With a good fertile-loamy well draining top-soil, best quality hybrid grass type(s), 1-3 inches of water per week, plenty of sun-light, ...almost anyone can have an excellent lawn with a minimum maintenance effort.
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I Hope this has answered your question(s)!
Have the best Summer ever!

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