Your Dog Can Smell Your Stress — Here's What the Science Says

By your dedicated walkers at Larne Dog Walking.

You've had a rotten day. You haven't said a word about it, you've put the kettle on like normal — and the dog is already glued to your side, or pacing, or just watching you a bit more closely than usual.

It's tempting to put that down to coincidence. The science says otherwise. Two studies — one of them right here in Belfast — show that dogs can smell human stress, and that the smell changes how they feel.

The Belfast study: stress has a smell

In 2022, researchers at Queen's University Belfast collected breath and sweat samples from 36 people, once before and once straight after a fast-paced maths task designed to put them under pressure. Heart rate and blood pressure went up, and so did how stressed people said they felt.

Then they trained four dogs to find the stress sample in a line-up.

Here's the clever bit. The stress sample and the relaxed sample came from the same person, taken just minutes apart. Same skin, same soap, same everything. The only thing that had changed was how stressed they were.

Across 720 trials, the dogs picked out the stress sample 675 times — 93.75%. And they were just as accurate the very first time they met a person's samples.

So stress isn't only something you feel. It changes the smell of your breath and your sweat, and a dog's nose can read the difference.

The Bristol study: the smell changes how dogs feel

Knowing dogs can smell stress raises the obvious next question: does it do anything to them?

In 2024, researchers at the University of Bristol tested 18 dogs using a well-known test of mood. Each dog learned that a bowl in one spot always had a treat in it, and a bowl in another spot was always empty. Then the bowl was put somewhere in between — and the researchers watched how quickly the dog went to check it.

A dog that trots straight over is expecting good things. A dog that hangs back is expecting disappointment. Scientists call that optimism and pessimism.

The dogs did the test with no smell in the room, with the smell of a relaxed person, or with the smell of a stressed person — and these were strangers, people the dogs had never met.

With the stress smell around, the dogs were slower to go and check the uncertain bowl closest to the empty spot. The relaxed smell didn't have that effect. In other words, breathing in a stranger's stress made the dogs a little more pessimistic.

One of the researchers put it simply: even the smell of a stressed, unfamiliar person affects a dog's emotional state — and it travels through the air, not just down the lead.

What this means for your dog

Put the two studies together and you get something every dog owner half-knows already: your dog is reading the room, and part of the room is you.

That doesn't mean you're doing anything wrong. Life is stressful — work, money, kids, a bad night's sleep, a hard week. You can't switch it off, and nobody should feel guilty for being human. But it's worth knowing that it isn't private, and that it can show up in your dog.

It also means that when your dog seems on edge and you can't work out why, it's worth looking beyond the dog:

• The house. Building work, a new baby, visitors, a move, raised voices, someone ill.
• The street. Fireworks season, roadworks, a new dog next door.
• The people. Including you. Especially if the change in your dog started around the same time as a hard spell for you.

Dogs are a product of the lives they're living — and of how the people around them are feeling.

Small things that help

You can't make stress disappear, but you can stop it spilling over quite so much.

Take a breath before the lead goes on. Thirty seconds. Slow breath out. A walk that starts in a rush tends to stay rushed.

Keep the routine steady on the hard days. Dogs find predictability calming. Same walk times, same feeding times, same bedtime — even when everything else is all over the place.

Give them somewhere to go. A bed or den away from the busiest part of the house, where they can take themselves off when the atmosphere is heavy.

Let them sniff. Sniffing is one of the most settling things a dog can do. On a stressful day a slow, nose-down walk does more good than a fast one.

Don't punish the signs. Pacing, whining or clinginess on a tense day is a dog reacting to something real. A calm, ordinary response from you helps far more than a telling-off.

Know when to get help. If your dog has seemed anxious for weeks, or it's getting worse, talk to your vet — and rule out pain or illness first.

Why a calm walker matters

Here's where it comes back to how we work.

If dogs pick up the stress of strangers, then the person who walks your dog matters. A rushed walker, racing between too many dogs and running late, brings that into your hallway. Your dog smells it before the lead is even clipped on.

[IMAGE 3 GOES HERE — a dog walker crouched calmly on a doorstep letting a terrier sniff their hand before the lead goes on. Alt text: "A dog walker crouching calmly on a doorstep in Larne, letting a terrier sniff their hand before a walk." Caption: The walk starts before the front door. Calm in, calm out.]

That's why every session with us starts the same way. Your dedicated walker arrives calm, greets your dog the same way every visit, and takes a moment before anything else happens. No chaos at the door. A walker your dog knows, doing things in an order your dog can predict, is a calm thing to come home to — whatever kind of day the house is having.

It's also why the walk report matters. On the days you're stretched thin, it tells you exactly how your dog got on: how they settled, what they enjoyed, whether anything bothered them. You don't have to guess, and you don't have to worry that your bad day became theirs.

That's what Larne Structured Walks™ are built around — a dedicated walker, a session with a purpose, and a walk report every time. And it's part of what we mean by They Come Alive: a dog who feels safe, settled and understood, on the good days and the hard ones.

If your dog seems unsettled at the moment, our guide to fireworks season and the five signs a dog is overwhelmed are worth a read. And if you'd like a calm, steady presence in your dog's week, tell us about them — we'd love to meet them.

Studies: Wilson C. et al. (2022), "Dogs can discriminate between human baseline and psychological stress condition odours", PLOS ONE. Parr-Cortes Z., Rooney N. et al. (2024), "The odour of an unfamiliar stressed or relaxed person affects dogs' responses to a cognitive bias test", Scientific Reports.