An evolutionary reason to lick the mouth
Of all the possible reasons why a dog can find itself in the situation of licking the mouth of a human being, the most picturesque, and no less real, is the one that takes us back to the most tender time of the animal, when it is still a puppy .The wolves themselves lick the mouths of their parents with the aim of inducing them to vomit, making them regurgitate the food they may have recently ingested, and be able to feed on it.
Yes, here we find a very pronounced cultural barrier between what a dog can expect and what we can give it. However, this is an atavistic trait, that is, it belongs to its most primitive stage and it creeps into behavior.
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