Yellow spots on the lawn are normally caused by urine, Nitrogen waste products are the result of protein breakdown through normal bodily processes. therefore the nitrogen in the urine causes the lawn spots. We all know that Nitrogen is a great fertiliser but not in these doses that is why the outside of the brown spot is quite lush.

A dose of one teaspoon to one tablespoon of apple cider vinegar (depending on the size of the dog) per day will nullify the Nitrogen imbalance and should solve the problem. The apple cider vinegar can be added to the dog's water or put directly on his food. The natural type from a health food store, not the pasteurized version from the supermarket. I find the apple cider vinegar from horse tack shops are the best. Two tablespoons of tomato juice on the dog's food twice a day will have the same effect.

If the dogs have already urinated and she has not been treated, then saturate the urinated areas (spots) with water. This will allow the excess nitrogen to leech or dilute through the lawn and reduce the concentration in one area. It is usually best to treat the areas up to 9 hours after urination and to apply at least three times the amount of water to urine to the area.

There is also something called DOG ROCKS which are an Australian/New Zealand product that are apparently safe for all of your pets, young and old. It is supposed to start improving your lawn within 5 weeks. They normally need to be replaced about every 2 or 3 months and should be placed into no more than 2 litres (0.5 gal) of water. Dog rocks are a mineralised rock which when placed in a dog's water bowl changes the Nitrogen levels of a dog's urine, meaning it won't stain grass. The key element is Zeolite, which neutralises Nitrogen levels without altering the pH level of the water.

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