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Licking can be used as grooming for dogs, and if they want to groom you, it can be a sign of affection. Maybe they think you need to be spiffed up a little.
http://answers.ask.com/Science/Nature/why_do_dogs_...
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Anyone who has ever lived with or around dogs knows that when a dog injures itself, it treats its wound by licking it. Nor are dogs the only creatures to do so. Cats--wild and domestic
http://www.ehow.com/about_6580198_do-dogs-lick-hum...
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Dogs lick for many different reasons. It's one of the main ways they communicate. They may lick another dog to show respect, they may lick a person because they like them. For dogs,
http://answers.ask.com/Science/Nature/why_dogs_lic...
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Dogs lick for a few reasons. It might be a sign of affection or submission. A submissive dog will like the underside of a dominant dog's chin to show that they are not challenging
http://answers.ask.com/Science/Nature/why_do_dogs_...
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