According to Suite101.com:
“Urine smell from pets can ruin the most beautiful of homes. What makes dealing with that urine smell especially difficult is that after just a few weeks, the unsuspecting pet owner can become completely desensitized to the smell, not realizing how offensive it really is to visiting family and friends.
Urine smell from pets goes beyond home owner embarrassment. If you are considering putting your home on the market; that offensive odor will directly affect the sale price.”