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One explanation is that it is a sign of affection. Nuzzling, licking, and even nibbling on the ears of another pack member (in this case, you) can be a means to show that your pup is comfortable with you. ... Licking seems to be especially prevalent with dogs who are more submissive in nature.
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Your Dog is Licking Ears Because Dogs Can Be Gross.

Sometimes, however, ear licking goes back to another innate Dog behavior: being a little bit disgusting sometimes.

Other Dogs are attracted to the change in smell (and probably taste) of the discharge in an ear when there is an infection present.

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