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They are marking their territory. They will either smell another dog's urine and urinate over that or, they will mark their own territory such as the backyard/frontyard, etc.

it tells them that that is their territory. if one dog, wolf, ... sees anouther dog mark its territory onto theirs, it will usually start a fight. think about this example to help you understand if you get a glass of milk and you take a drink, that cup is your territory until you are done. lets say your little brother or sister comes into the room and takes a drink out of your cup. you get mad because that cup is your territory. it is the same thing with dogs, its normal.

What dogs smell, whether it's urine or another dog's butt, tells the dog just about everything about the other dog. Dogs have millions more scent receptors than do humans and they way the process smells is very different than we do. For dogs, scents are comparable, almost, to how we perceive things by sight. The smell of another dogs urine tells them everything about that dog -- it's sex, whether it's in season, whether the other dog is healthy or not, etcetera. Once they determine what the scent is telling them, they pee over it to mark the territory as their own or just to let anyone else coming by that they were there, thus leaving their own information-filled scent.

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βˆ™ 2009-09-16 01:45:42
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Q: Why do dogs sniff when they need to urinate and what would be the exact reason they sniff?
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