Of the species, generation after generation, although today it does not make any sense, especially in a domestic environment. Licking to get regurgitation is a survival instinct that has been passed down from wolves to dogs over thousands of years of evolution, and remains that way.
On the other hand, this fact is not only focused on achieving such an eschatological act, but it is also a message of submission and vulnerability. What they are communicating when they lick your mouth or the corners of your lips is that you have a close relationship in which they give themselves and ask for your support, protection and food. It is the closest thing to saying “I love you”, asking that the trust that unites you materialize in deeds.
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