The Science of Licking: Why Your Dog's Natural Calming Mechanism Is More Powerful Than You Think

Have you ever noticed your dog licking their paws after something stressful? Or how some dogs seem to settle faster after chewing something?  It’s often dismissed as a habit or a distraction, but licking is neither of those things.  It’s a biological mechanism that has a measurable effect on your dog’s nervous system.  Licking has been studied in clinical settings and is increasingly being recognised by veterinary behaviourists as a genuine anxiety management tool.

Understanding why it works changes how you think about enrichment.  You stop seeing a lick mat as a clever way to keep your dog busy and start seeing it for what it actually is: a way to help your dog’s body shift its own physiological state.

Two Modes: Fight-or-Flight and Rest-and-Digest

To understand what licking does, it helps to understand the two systems it works with.  Just like us, our dogs have an autonomic nervous system with two main branches.

The Sympathetic Nervous System (SNS) is the body’s emergency response and prepares the body for action.  When your dog is anxious, startled or threatened, their SNS activates.  This causes an increase in their heart rate, their pupils dilate, their muscles tense and their digestion pauses.  This is the fight-or-flight state and it’s unsustainable, it burns energy and it keeps their body on high alert.

The Parasympathetic Nervous System (PNS) is the counterbalance.  It’s responsible for rest and recovery; a slower heart rate, relaxed muscles, resumed digestion and calmer breathing.  When the PNS is dominant, your dog is in a state where they can eat normally, sleep properly, learn and regulate their emotions.

When your dog is anxious, their SNS takes over.  The goal of any calming intervention is to activate the PNS and help the body return to balance.

Reference: Koolhaas JM, et al. (2011). Stress revisited: A critical evaluation of the stress concept. Neuroscience & Biobehavioral Reviews, 35(5), 1291–1301.

The Vagus Nerve: The Pathway That Makes It Work

The mechanism that connects licking to calm is the vagus nerve, one of the longest nerves in the body, running from the brainstem through the neck, chest and into the abdomen.  It connects the brain to the heart, the lungs and the gut, and it is the primary channel through which the PNS operates.

When the vagus nerve is stimulated, through breathing exercises, gentle touch, or repetitive rhythmic physical actions such as licking, it activates the PNS.  This is why sustained licking has a measurably different effect from a quick lick.  A single lick produces no meaningful change, but a sustained, rhythmic licking pattern, the kind that a textured lick mat is specifically designed to produce, generates a prolonged vagal stimulus.  The body doesn’t just briefly pause the stress response, it begins to actively shift out of it.

This is also why the texture and the design of a lick mat matters more than it might at first appear.  A smooth surface provides the food immediately, the interaction is over in seconds, and the nervous system receives no meaningful input.  A textured surface, on the other hand, with grooves, ridges and patterns requires repeated, focused engagement.  This means your dog has to work methodically, and it is that repetitive pattern that creates and sustains the vagal activation.

Reference: Porges SW. (2007). The polyvagal perspective. Biological Psychology, 74(2), 116–143. | O'Neill DG, Hall EJ. (2020). Vagus nerve function and dysfunction in dogs. Veterinary Record, 186(7), 217–222.

What the Research Actually Shows

The research base for enrichment-based calming in dogs is growing and while no single study has been conducted exclusively on lick mats, there is evidence to support their use.

A 2014 randomised controlled trial by Herron, Kirby-Madden and Lord, published in the Journal of the American Veterinary Medical Association, studied the effects of food-toy enrichment on shelter dogs, one of the most anxious dog populations imaginable.  Dogs given daily food-filled enrichment showed significantly reduced stress-related behaviour compared to the control group.  This was a study of 107 dogs, much more than most observational studies.

In a later study published in Animals (MDPI), Bowman and colleagues examined the effects of different types of enrichment on heart rate variability (HRV) again in shelter dogs.  This looked at the physiological measures of autonomic nervous system balance.  They found music produced the most significant increases in HRV, indicating measurable shifts towards parasympathetic dominance.  This study is relevant because it shows that non-pharmaceutical interventions can produce real, measurable changes in nervous system state in dogs, the same physiological pathway that sustained licking engages.

References: Herron ME, Kirby-Madden TM, Lord LK. (2014). Effects of environmental enrichment on the behavior of shelter dogs. Journal of the American Veterinary Medical Association, 244(6), 687–692. | Bowman A, et al. (2020). Effects of olfactory and auditory enrichment on heart rate variability in shelter dogs. Animals (MDPI), 10(8), 1385

Why Texture Is Not a Marketing Detail

Texture is often seen as a design preference rather than a functional one.  The calming effect of licking is produced by sustained, rhythmic engagement.  That engagement is only possible on certain surfaces.  A smooth bowl with food in it produces one or two licks and it’s over.  A well-designed lick mat with a varied texture and depth means your dog has to work systematically, returning to the ridges and grooves repeatedly over many minutes.  That’s the difference between a brief interaction and a genuine calming session.

The duration matters because the vagal activation that produces the calm doesn’t happen instantaneously, but rather it builds with sustained effort.  Research on the nervous system response to rhythmic repetitive behaviours, whether it's in humans or dogs, consistently shows that the effect is proportional to the duration of the activity, not to its intensity.  A minute of licking produces a very different physiological response from ten minutes.

At Paw by Four, the texture design of The Travel Buddy, The Steady Eddie and The Brave Maker was developed specifically to produce sustained engagement, to do the job the science says is necessary for the calming effect to take effect.

What This Means In Practice

Understanding the physiology behind licking gives a clearer framework for when and how to use a lick mat more effectively.   A few things worth bearing in mind:

• Timing matters.  A lick mat is most effective when it is introduced before or during the stressful event, not after your dog is already in acute distress.  The goal is to activate the PNS early, before the SNS is fully dominant.  

• Familiarity helps.  If your dog associates their lick mat with calm, they will respond to it faster over time.  The mat becomes a conditioned cue for the calming state, not just a source of food.

• What you spread matters too.  High-value, lickable foods, like natural nut butter without any xylitol, plain Greek yoghurt, wet food, mashed apple, all create stronger motivation for your dog to engage for longer.  Longer engagement means more sustained vagal activation.

• A lick mat is not a treatment for clinical anxiety.  If your dog has a diagnosed anxiety disorder, a lick mat is a useful part of a broader management approach, along with professional behaviour support, environmental management and, in some cases, medication.  It is not a substitute for any of those things.

If you’re still working out whether what you’re dealing with is true anxiety, our Canine Anxiety Profile Assessment can help.  And our Dog Anxiety Guide & Tracker walks through the different anxiety types and the evidence-based approaches that work for each for each.

A final note

Licking isn’t magic and a lick mat is not a cure.  But the science behind what sustained, rhythmic licking does to the canine nervous system is real, well-supported and increasingly recognised across veterinary behaviour and animal welfare research.

When you give your anxious dog a lick mat loaded with things that they love, you’re not just keeping them occupied, you’re giving their body a physiological tool to shift its own state, to move from the stress system into the calm system.  That’s not a marketing claim, it’s how the nervous system works.

Explore the lick mat range: The Travel Buddy | The Steady Eddie | The Brave Maker

Guides and resources: https://pawbyfour.com/collections/digital-guides-downloads