by 
Anonymous
ANSWERS: 2
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It's all a matter of how animals mark their territory. They leave their scent behind by peeing on stuff. Why fire hydrants in particular I have no idea probably just because they happen to be there when the dog needs to pee, and peeing on the ground dos'nt leave behind as noticeable of a scent.
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Yes, it's like a tree stump in a city. Dogs normally mark on trees, but cities have few of them so hydrants will do. They would pee on signposts but they are too narrow so they would miss. Hydrants are nice and fat, and just the right size. When they sniff hydrants they gather all kinds of information.... like Pippi the poodle was there that day and she's in heat, or that Boris the wolfhound has a bladder infection or that Max the pit bull had fish for dinner. They sniff dried pee to gather data, the same way we surf the internet to learn about the world.
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