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Home Alone

Understanding separation anxiety and separation related behaviours in dogs — what they really are, and what you can do.

Milo meets his guardian at the door every evening with the same full-body wag, so when the downstairs neighbour mentioned — a little awkwardly — that Milo “cries for hours” each morning, his guardian was stunned. Then the other pieces started to fit together: the scratched paint by the front door, a puddle in the hallway where there hadn’t been one in years, a chewed corner of skirting board.

The easy explanation — the one that keeps so many guardians awake at night — is that the dog is being naughty, or spiteful, or “getting back at us” for leaving. But Milo isn’t doing any of that. Milo is frightened. What looks like misbehaviour is a dog who genuinely cannot cope with being left alone.

If any of that feels familiar, you are in very good company — and there is a great deal we can do about it. This article walks through what separation problems actually are, what the research tells us, the signs worth watching for, what you can start doing yourself, and when it is time to bring in a professional.

What separation related problems actually are

At its simplest, a separation problem is a dog struggling to cope on their own. Left alone — or even just anticipating being left — the dog experiences real distress, and that distress spills out as barking, chewing, pacing, toileting or a dozen other behaviours. The behaviour is the visible tip of an emotional state underneath (think of the tip of the iceberg).

This matters, because it changes everything about how we respond. A dog chewing the door frame is not staging a protest; a dog toileting indoors is not being defiant. Dogs don’t plan revenge. They act on how they feel in the moment — and a dog left beyond what they can handle feels unsafe.

You’ll often hear this called separation anxiety, and that’s the term most people search for. But professionals increasingly prefer Separation Related Behaviours (or separation related problems), for one important reason: it isn’t always anxiety. As we’ll see, the feeling underneath can be fear, panic, frustration or even boredom — and telling them apart can be part of the key to helping.

More common than you might think

Separation problems are one of the most frequently reported behaviour issues in dogs — you are far from alone. Exactly how common is genuinely hard to pin down, because so much of it happens when nobody is home to see it. Estimates in the research range enormously, from around 6% to over 50% of dogs depending on how the study measured it, with a commonly cited figure of roughly 14–20%. One large study of anxiety in pet dogs put separation problems at around 17% (Tiira, Sulkama & Lohi, 2016).

Because much of the behaviour is unwitnessed — the quiet distress, the pacing, the drooling — the true figure is very likely underestimated. Separation problems also rarely travel alone: they frequently overlap with noise sensitivity and general fearfulness, which is part of why looking at the whole dog matters so much.

It isn’t one single thing

Here is the idea that changes how good help is delivered: “separation anxiety” is not one condition with one cause. Different dogs are distressed for genuinely different reasons, and the emotional driver shapes both the signs and the solution.

When researchers at the University of Lincoln analysed 762 dogs with separation related problems, the dogs didn’t form one uniform group — they fell into several distinct sub-groups, including exit-frustration, over-arousal that spills into reactivity, and boredom-related patterns (de Assis et al., 2020). Other work has shown that the behaviour a dog displays when alone maps onto their underlying emotional state, whether that leans towards fear and panic or towards frustration (Lenkei, Faragó, Bakos & Pongrácz, 2021).

In plain terms, a dog left alone may be:

Frightened or panicked — genuinely afraid, sometimes to the point of panic, escape attempts or self-injury.
Frustrated — not fearful so much as unable to bear being shut away from their person, or from something they want access to.
Under-stimulated or bored — a dog whose needs for activity and enrichment aren’t being met, filling the empty hours with destruction.

This is the heart of the psychobiological approach developed by Professor Daniel Mills: without working out what is actually driving the behaviour in the individual dog, treatment tends to be hit-and-miss (Mills, 2025). Your dog is an individual, and the help has to fit your particular dog.

And this isn’t just labelling — it changes the help itself. A frightened dog usually needs the world to feel less threatening first: we let their nervous system learn, gently and well within their comfort, that the thing isn’t actually dangerous, and only then build good associations around it. A frustrated dog needs something different to come first — a sense of predictability and control, a reliable way to cope and to know what’s coming — before we work on the specific triggers. Get these the wrong way round, and progress can stall. And tellingly, much of what we label separation ‘anxiety’ actually leans towards frustration — often bound up with the loss of a trusted person who makes the world feel safe — which is one more reason a careful look at your own individual dog comes before any plan.

Why does it happen?

There is rarely a single cause. Separation problems usually emerge from a mix of ingredients, and it’s worth naming them — not to assign blame, but to understand:

Early life. A dog’s earliest weeks matter. Poorer maternal care and fewer early socialisation experiences are linked to greater fearfulness later on (Tiira & Lohi, 2015), and large longitudinal work is now tracing how early-life factors shape separation behaviour in young dogs (Dale et al., 2024).
Life changes. Rehoming, a house move, a new baby, a change in working hours — anything that disrupts routine and undermines a dog’s sense of safety can trigger or worsen separation problems (Almquist et al., 2026).
The body. Pain, illness, gut discomfort, poor sleep and the changes of ageing can all sit underneath the behaviour or amplify it. In referred behaviour caseloads, a conservative estimate is that around a third of cases involve some form of painful condition — and sometimes considerably more (Mills et al., 2020). That is why a vet check is so often the most valuable first step.
The relationship — without blame. How safe a dog feels is shaped by the person they rely on. That is not the same as fault. The old advice to “not make a fuss” or to toughen a dog up has no good evidence behind it; what helps is becoming a calm, reliable source of safety.

Let’s be clear on that last point, because guilt is almost universal among guardians of these dogs: you did not “cause” this by loving your dog. You are not the problem — you are the single biggest part of the solution.

Signs to look for

Some signs are obvious. Others are quiet and easily missed — and it’s often the quiet ones that tell you a dog is truly struggling.

The more obvious signs:

Barking, howling or whining when left alone.
Destruction, often focused around exits — doors, windows, door frames.
Toileting indoors despite being reliably house-trained.

The subtler, easily-missed signs:

Pacing, circling or an inability to settle.
Panting, drooling or trembling that isn’t explained by heat or exertion.
Lip licking or yawning out of context.
Refusing food or treats while alone, even favourites.
Shadowing you from room to room, and visible unease as you get ready to leave.
Attempts to escape — which can lead to injury.
The “shut-down” dog. Some dogs don’t bark or destroy; they freeze, go very still and simply endure. Silent doesn’t mean fine.

Because so much of this happens behind a closed door, a short video of your dog while you’re out reveals far more than the aftermath ever will. There’s no need to obsess over filming — a good professional will guide what’s useful — but even a few minutes can be genuinely eye-opening.

What you can do yourself — first steps

You don’t have to wait to start helping. A few foundations make a real difference and do no harm:

Rule out the physical first. A vet check for pain or illness is a sensible starting point, especially if the behaviour appeared or worsened suddenly.
Let go of the guilt and the blame. This is distress, not defiance. Punishment — even a frustrated sigh — can make a frightened dog more frightened.
For now, try not to leave them alone beyond what they can handle. Every panicked absence is, in effect, practice at panicking. Lean on dog-sitters, family or daycare; some dogs are quite content waiting briefly in the car while you shop (only where it’s safe and the temperature allows).
Build a sense of safety. A comfortable place to retreat to, predictable daily rhythms, and you as a steady, reassuring presence all help a dog’s nervous system settle.
Support the whole dog. Good, unbroken sleep; the right kind of exercise (sniffing and decompression, not just more of it); enrichment; and some genuine choice in their day all lower the overall stress load and build resilience.
Look after yourself, too. Living with this is hard, and your own state matters — dogs and their guardians even tend to synchronise stress over time (Sundman et al., 2019). Being kind to yourself is part of the plan.

And a few things to avoid: don’t simply leave a distressed dog to “cry it out” or leave them longer to “get used to it” (this usually backfires); don’t punish; don’t rush; and don’t get a second dog as a fix — it rarely solves the problem and can add a second one.

When to definitely reach out to a professional

Some situations really do call for qualified, personalised help. Please don’t wait if you see:

Signs of panic, escape attempts, or any self-injury.
Distress-driven toileting, drooling or destruction.
No improvement, or a picture that’s getting worse.
Other behaviour problems alongside it — aggression, noise fears, and so on.
A life where you simply can’t avoid leaving your dog alone, and you need a workable plan.
Any suspicion of pain or a medical component.

And honestly — whenever you feel out of your depth. Reaching out early isn’t a failure; it’s a welfare decision. Your dog deserves the right help sooner rather than later, and a qualified, force-free separation specialist (who is willing to work with your vet, or a veterinary behaviourist, where needed) can pinpoint what’s driving the distress and build a plan that fits your dog and your life.

There is real hope

Here is the good news, and it’s well earned: separation problems are treatable, and modern emotion-first approaches genuinely work. Research has even shown that as treatment succeeds, dogs become measurably more optimistic — their underlying outlook shifts from pessimistic towards positive (Karagiannis, Burman & Mills, 2015). That’s not a dog learning to endure being alone. That’s a dog whose feelings have actually changed.

Because at the heart of all of this is one simple idea: we are not training a behaviour — we are helping your dog’s brain learn that being alone can feel safe.

Would you like some help?

If you recognise your own dog in Milo’s story, I’d love to help. You can book a free, no-obligation initial chat of up to 30 minutes by emailing tina@tinashappyhounds.dk.

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