The science behind sniff walks

Have you noticed that your dog will intently sniff a certain spot for what feels like forever? Sure it’s not so fun for us but there’s a good reason for it. The odour concentration of a scent molecule builds up over multiple sniffs, so don’t drag them away after a quick sniff. Let them take it all in! All those smells need to be processed somewhere, so their incredible brains work overtime. You’ll be surprised how exhausted they are after a Sniffari. 

Behaving naturally and making active choices are two key factors in maintaining your dog’s mental health. Meaning, letting your dog be a dog (through sniffing) can calm and relax them, improving their mental health. Sniffari’s may even result in less destructive behaviour at home.

Rule of paw

A dog’s nose can get them into trouble, especially if they’re strong foragers. Keep a close eye on your dog to ensure they’re not eating anything nasty or dangerous as they explore. 

Most local councils require dogs to be on-leash when not in the dog park. This is not only for your dog’s safety, but that of other dogs too.

Always use treats when walking to keep their attention on you. Whenever you need to distract them, call their name and reward them for focusing their attention on you. Then ask them to sit and reward. Our Belt Bag is an excellent tool for this. 

If your dog pulls on the lead, invest in a specifically designed walking harness that reduces pulling.

Your dog stops dead on the footpath. Nose down, completely absorbed, going absolutely nowhere. Every instinct tells you to keep moving. But what's actually happening in that moment is far more interesting than it looks.

That sniff isn't a distraction. For your dog, it's the whole point.

Key Takeaways

• Dogs have up to 300 million olfactory receptors, and smell is their primary sense
• Sniffing activates the parasympathetic nervous system, actively shifting dogs into a calmer state
• Research shows dogs who do regular nose-based activities become measurably more optimistic
• Letting your dog choose where to sniff is part of the benefit 
• A 20-minute Sniffari can be more mentally tiring than a brisk 45-minute walk

Their Nose is Doing a Lot More Than You Think

Dogs don't experience the world the way we do. For us, sight leads. For them, it smells.

Research has found that a dog's olfactory bulb is approximately 30 times larger than a human's, and their olfactory epithelium contains between 200 million and 1 billion olfactory receptors, depending on breed, compared to around 5 million in humans. 

When your dog sniffs a single spot for what feels like forever, they're pulling in layers of information: who's been there, when, what they've eaten, and whether they're a regular. Odour concentration builds up over multiple sniffs. Pulling them away after a quick inhale means they never get to finish the sentence.

What Sniffing Does to the Brain

Scent information travels through a broad network in the dog brain, including regions linked to memory, emotion, and decision-making. When your dog is happily investigating a patch of grass, their nervous system is literally shifting gears.

Sniffing engages the parasympathetic nervous system, the "rest and digest" branch that brings heart rate down and reduces stress arousal. It's the neurological opposite of a high-alert state.

There's also a dopamine connection. The seeking and foraging involved in sniffing trigger the brain's reward circuitry. That satisfied, calm dog you bring home after a slow sniff walk? That's a sign their brain has been working.

The Study That Changed How We Think About Sniff Walks

In 2019, researchers Charlotte Duranton and Alexandra Horowitz published a study finding that dogs who engaged in regular nosework activities showed significantly more optimistic behaviour than dogs who did heelwork instead. 

Two things made the difference: the opportunity to use their nose freely, and the ability to make their own choices about where to sniff and for how long.

How to Do a Sniffari

You don't need to rethink your whole routine. Sniff walks aren't a replacement for physical exercise; they're a different kind of fuel. Think of regular walks as cardio, and Sniffaris as the mental workout.

A few things that help:

• Slow right down. The whole point is to follow the nose, not to cover ground. Let them set the pace entirely.
• Choose quieter spots where possible. Lower-stimulus environments let your dog settle into proper sniff mode without competing distractions.
• Keep a close eye on what they're investigating. A dog's nose can lead them somewhere you'd rather it didn't. Strong foragers especially need supervision.
• Use treats to keep their attention when you need it. Call their name, reward them for responding, then ask for a sit and reward again. This keeps things safe without shutting down the session. Using a dog treat belt bag for easy access can make regular rewarding more accessible. Consider using low-fat dog treats if your dog is prone to weight gain. 
• On-leash is completely fine. Most councils require it outside off-lead areas anyway. A longer lead gives them more room to explore while keeping everyone safe - just be careful of pedestrians, other dogs and the nearby cars.

Which Dogs Benefit Most?

Honestly? Most of them.

Sniff walks tend to make a particularly noticeable difference for dogs who seem restless or anxious at home despite getting regular exercise, high-energy breeds who are physically tired but still mentally wired, older dogs who can't manage big distances but still need engagement, and dogs with reactive tendencies. Sniffing can help reset their nervous system after a stressful encounter on the lead.

The research suggests that giving dogs the chance to behave naturally is important for mental health, not just a nice-to-have.

So next time your dog plants their nose in the footpath and refuses to budge, let them linger. They're not being difficult. They're just reading.

For everything your dog needs between walks, explore our dog care products.