by 
The Curious Bag
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<h4 class="dechead">On One Hand: Veterinarians Recommend Ammonia
Dr. Jon Rappaport, DVM recommends the use of ammonia as a cat repellent for flower beds. He advises that pet owners bury baby food jars in the garden with their tops level with the ground. Leave the jars open and fill them with diluted ammonia.
On the Other: Ammonia May Encourage Spraying
According to Nancy Otten, Animal Health Technologist, ammonia is a primary component of cat urine. A cat may therefore be more likely to urinate or spray in an area that smells of ammonia. This may make ammonia an attractant for some cats, rather than a repellent.
Bottom Line
Try ammonia in a test area first. If the cat avoids the test area, then apply the ammonia to the area you actually want the cat to avoid. If the cat continues to frequent the test area, or he sprays or urinates there, ammonia will not be a good cat repellent for you.
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