👅 The face wash

Why Does My Dog Lick Me So Much?

A behaviour with four separate jobs, which is why it happens so much.

It starts as a puppy greeting

Wolf and dog puppies lick at the mouths of returning adults — a behaviour that in wild canids prompts regurgitation of food. Domestic dogs keep the gesture long after the function disappears.

That is why face-licking in particular is so persistent, and why it is aimed at your mouth when it can reach it. It is the canine equivalent of a greeting at the door, retained from puppyhood into a relationship where it no longer produces dinner.

It is also social grooming and information

Dogs that get along groom each other, and licking is the main method. Directed at you, it is affiliative — the same behaviour a dog offers a dog it is comfortable with.

There is a sensory element too. A dog's sense of smell is in a different league to ours, and licking brings scent molecules into contact with the vomeronasal organ in the roof of the mouth. Your skin carries salt, sweat and a great deal of information about where you have been. Some of the licking is simply reading.

And you have probably trained it

Here is the part most people miss. Licking reliably produces a reaction — laughing, talking, pushing the dog away, standing up. All of those are attention, and attention is the reward. A behaviour that works gets repeated.

If you want less of it, the mechanism is simple and the discipline is the hard part: no reaction at all. Stand up, turn away, end the interaction without a word. Then give attention a few seconds later when the dog is doing something else. Dogs learn this quickly, provided you do not slip and respond occasionally.

When licking is a symptom

Two patterns are worth attention. Compulsive licking of you — prolonged, hard to interrupt, almost trance-like — can be a stress behaviour, and in some dogs is linked to anxiety or to nausea.

Obsessive licking of surfaces, especially floors and carpets, has a documented association with gastrointestinal disease; one study found that a majority of dogs presenting with excessive surface licking had an identifiable GI problem, and most improved with treatment. That one is a vet visit, not a training issue.

On hygiene: for most healthy people, a dog licking intact skin is low risk. Avoid letting a dog lick open wounds, broken skin, or the faces of infants and immunocompromised people, and wash afterwards.

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