Dog Spots-
There are lots of old “theories” circulating about just what in the urine causes the killing off of your prized Bermuda grass. The most common of these misguided opinions is that the urine is acidic and ‘burns’ the grass. As a result, a host of home remedies have arisen to change the pH of the urine. These measures rarely work because the real culprit in urine burns is nitrogen.
Because dogs are carnivores and eat a high level of protein in their diet, they break the protein down and excrete it as nitrogen in the urine. The result is a killing of the grass from an overload of nitrogen. You will get the same kind of burn if you put a concentrated handful of fertilizer in one spot. These urine burns will often have a characteristic green ring around the outside edge where the urine was dilute enough to actually work as a fertilizer. This characteristic ring can also help distinguish urine burns from a grub infestation that will also create similarly looking brown spots.
There are a few things that make urine burns more prevalent:
• Urine burns tend to be worse with female dogs because they squat and deposit their urine in one place.
• They also are worse in large dogs because they deposit a larger quantity of urine.
• They are worse on yards that are already fertilized regularly.
• Grasses like bluegrass or Bermuda grass are much more sensitive to nitrogen than rye or fescue.
• Lawns that are stressed from drought or disease, or those that are recently sodded or seeded are more susceptible to lawn burn.
• And finally, they are always worse when your neighbor’s dog goes on your yard!