Dog separation anxiety shows up as barking, destructive chewing near doors and windows, pacing, and toileting accidents, usually within the first 15 to 30 minutes of being left alone. It's a fear response, not disobedience, and the most effective treatment is gradual desensitisation: building up alone-time in small increments the dog can handle without panicking. Severe cases benefit from a certified trainer or vet, and a calming supplement can support the process without replacing it.

Most dogs settle within a few minutes of being left alone. Some don't. If yours paces by the door, barks until a neighbour complains, or comes back to a chewed skirting board every time you leave, you're not dealing with a naughty dog. You're dealing with a dog whose nervous system reads "alone" as a threat.

What separation anxiety looks like

The signs usually show up in the first 15 to 30 minutes after you leave, not hours later. Owners report barking or howling, destructive chewing concentrated around doors and windows, pacing, drooling, and toileting accidents in dogs who are otherwise fully house-trained. Some dogs self-injure trying to escape a crate or room. Others go quiet and simply refuse to eat while alone, which is easy to miss if nobody's watching.

A useful way to tell it apart from boredom: boredom chewing tends to be scattered around the room, wherever something interesting was left out. Anxiety chewing concentrates at exit points, the door frame, the letterbox, the window ledge, because the dog is trying to get back to you.

A dog resting its paws on a window ledge, watching outside attentively
The signs worth watching for show up fast, usually in the first fifteen to thirty minutes alone, not gradually over hours.

Why it happens

Dogs are a social species that evolved to live in a group. Being left alone isn't neutral to them the way it might be to a cat. Puppies who were never gradually taught that alone-time is safe, dogs adopted from shelters, and dogs who've had a recent change in routine (a house move, a new work schedule, an owner returning to the office after months at home) are all more likely to develop it. It's not a training failure on the owner's part. It's closer to a phobia, and phobias respond to a specific kind of gradual, patient exposure, not to punishment or a firmer voice.

The remedy that actually has evidence behind it: gradual desensitisation

The core, well-established approach is to build up alone-time in increments too small for the dog to panic at. That means leaving for five seconds, then ten, then thirty, over days and weeks, always returning before anxiety kicks in rather than after. Rushing this (going straight to a 45-minute absence because the dog "seemed fine" at five minutes) is the most common reason it fails.

Alongside that, there are activities conducive to calm in dogs.

Exercise before you leave. A dog who's had a walk and a chance to toilet is starting from a calmer baseline than one pulled straight from the sofa.

A consistent departure routine, rather than a dramatic goodbye. Long, emotional farewells teach the dog that your leaving is a big event worth being anxious about.

Something to do while alone. A stuffed food toy given right as you leave associates the moment of departure with something good, not something ominous.

For dogs whose anxiety is severe, a vet or a certified separation anxiety trainer can help build a structured plan, and in some cases medication is appropriate alongside training. That's not a failure of the dog or the owner. It's the same as any other phobia: sometimes the nervous system needs more support to get through the early stages of retraining.

A stuffed food toy resting on a woven mat beside a front door
Something calm to do at the exact moment of departure, paired with a consistent, undramatic routine, does more here than anything said or done at the door itself.

Where daily calming support fits in

Training changes behaviour over weeks. Some dogs also do better with a nervous system that isn't running quite so hot to begin with, which is where a daily calming supplement can help, not as a replacement for training, but as something that makes the dog easier to work with while the training does its job. Broono Calm is built around L-theanine (from green tea) and passionflower, both studied for their calming effect without sedation. One trial of L-theanine in storm-sensitive dogs found meaningful improvement in fear responses over the study period (Pike, Horwitz and Lobprise, 2015); a separate review of dietary tryptophan in mildly anxious dogs found similar promise (Bosch et al., 2009).

None of this is a quick fix, and any product that promises one for a phobia this deep-rooted should be treated with suspicion. What's realistic is a calmer starting point for the training to build on.

If you're not sure whether your dog's signals point toward separation anxiety, general anxiety, or something else, our two-minute longevity assessment maps the specific behaviours you're seeing to the systems most likely behind them, and suggests where to start.

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