How Do Dogs Find Their Way Home?

Every so often, a dog does something that seems almost impossible.

Bobbie the Wonder Dog famously travelled thousands of miles back to his family after becoming separated from them. Other dogs have returned across unfamiliar countryside, navigated through towns or appeared back at places their owners had long since given up searching.

Stories like these tend to be described as extraordinary feats of memory or smell. Both probably matter. But research into canine navigation suggests there may be more going on.

Dogs appear capable of using different strategies depending on where they are and what information is available to them. They can follow routes they’ve travelled before, use scent and other environmental cues, and sometimes take entirely new routes towards a familiar destination.

There is even evidence that the Earth’s magnetic field may play a part.

Scientists are still working out how these pieces fit together.

Dogs remember where they’ve been

Anyone who walks the same routes regularly with their dog has probably seen some version of this.

Your dog knows which turning leads towards the park. They slow down before the house where the barking dog lives. They may pull towards a particular path before you’ve given any indication that you’re taking it.

That requires more than simply recognising individual objects.

Research into canine wayfinding has found that dogs can form spatial representations of routes and use that information flexibly. In one study involving guide dogs, researchers looked at their ability to reproduce a journey after travelling it once, return to the starting point, take shortcuts and negotiate detours. The dogs’ behaviour suggested they weren’t simply memorising a sequence of movements.

Exactly what a dog’s internal representation of an area looks like is harder to know. “Mental map” is a useful shorthand, but we shouldn’t imagine a canine version of Google Maps sitting inside their head.

What we can say is that dogs remember spatial information and can use previous experience to navigate.

Then there’s the nose

For a dog, the landscape contains information we’re almost completely oblivious to.

The ground, vegetation, other animals, people and moving air all carry odours. Dogs can detect and discriminate smells at concentrations far beyond human ability, and scent clearly provides information that can help them move through their surroundings.

Sometimes the simplest route home may therefore be the obvious one: follow the route you took on the way out.

Researchers studying free-ranging hunting dogs have actually observed this. When dogs travelled away from their owners and then returned, one strategy was to retrace the outbound route closely. The researchers called this tracking.

But the dogs didn’t always do that.

Sometimes they came back by an entirely different route.

And that’s where things become particularly interesting.

The dogs that took a shortcut

Between 2014 and 2017, researchers followed 27 hunting dogs during more than 600 excursions through forested areas in the Czech Republic.

The dogs wore GPS collars, allowing researchers to reconstruct their movements in considerable detail.

When they returned to their owners, they generally used one of two strategies. Some retraced their outbound journey. Others took a new route through the forest, a strategy the researchers called scouting.

Following your own route home is relatively easy to explain. Taking a new one is harder.

A dog travelling through dense forest can’t simply see its owner in the distance. If it isn’t following its outbound scent trail either, it needs some other way of working out which direction to travel.

The GPS data revealed something unexpected.

Before many of the scouting dogs began their journey back, they made a short run of roughly 20 metres aligned approximately north-south.

The direction of home didn’t explain it.

Magnetic north might.

Does your dog have an internal compass?

The researchers called this short movement a compass run.

Dogs that performed a north-south compass run before taking a new route back were more efficient at homing. The researchers proposed that the behaviour could help dogs establish their bearings using the Earth’s magnetic field before setting off towards their owner.  

It sounds fantastical, but this isn’t the only evidence that dogs can detect magnetic information.

Earlier research found that dogs showed north-south body alignment during certain behaviours when the Earth’s magnetic field was relatively calm. Other experiments have found that dogs can be trained to distinguish a magnet under controlled conditions.  

Taken together, the studies provide evidence that dogs are magnetosensitive.

What we don’t yet know is exactly how they perceive magnetic information, what biological mechanism is responsible, or how extensively ordinary pet dogs use it while navigating.

The hunting-dog study gives us an intriguing clue rather than a complete explanation of how dogs find their way home.

So how does a dog actually find its way back?

Probably not with one single system.

A dog travelling through familiar territory may have remembered routes and landmarks available to them. Scent can provide another layer of information. Their own movements may help them keep track of where they’ve travelled, and magnetic information could provide an additional reference for orientation.

Which cues matter most is likely to depend on the dog and the situation.

The hunting dogs in the Czech study demonstrated this beautifully. Sometimes they simply followed their original track back. At other times, they appeared able to orient themselves and choose a completely different route.

That flexibility may be more important than any one canine superpower.

Dogs don’t necessarily need a perfect map home if they can draw on several sources of information and switch between them.

What your dog is doing when they stop to sniff

None of this means that every time your dog plants their nose into a hedge they’re secretly checking the route home.

Usually they’ve just found something interesting.

But it does change the way you can think about a walk from a dog’s perspective.

We tend to experience a route visually. There’s the corner shop, the big oak tree, the crossing, the park entrance. A dog is moving through that same physical place with access to an enormous amount of olfactory information we don’t have.

My own dog can go from casually wandering beside me to completely absorbed in a scent within seconds. Head down, nose working, apparently deaf to everything else in the world.

I used to find it frustrating.

Now I find it fascinating.

She’s experiencing part of that landscape that I can’t.

And while science hasn’t yet given us a complete answer to how a dog separated from home can sometimes navigate back, we’re beginning to see just how many different kinds of information may be available to them along the way.

Perhaps the remarkable thing isn’t that some dogs find their way home.

It’s how much of the world they’re able to read while they’re trying.