The short answer

Dogs bark when left alone for a few common reasons: worry about being alone, boredom, or things they hear and see outside. Pain or illness can play a part too. Record a few ordinary days and listen back to see which it is, then work on that cause. If it looks like distress, talk to your vet.

Why dogs bark when they are alone

  • Distress at being alone. The RSPCA calls this separation-related behaviour, and says it often starts within a few to 30 minutes of you leaving. The ASPCA describes this barking as persistent, with no trigger except being alone. Other signs include chewing near doors or windows, and ignoring food toys while you are out.
  • Boredom and spare energy. A dog with too little to do may spend more time barking.
  • Things outside. Passers-by, the post, other dogs, noises on the stairs. Dogs that bark at triggers usually do it when you are home as well.
  • Pain, illness or hearing loss. If your dog barks more than usual, the RSPCA suggests checking for health problems first, including its hearing.

Find out what actually happens

You can’t fix what you can’t hear. Many owners only find out when a neighbour mentions it, and half of dogs who struggle alone show no obvious signs when you are with them. The RSPCA suggests a camera to check now and then.

Record two or three ordinary days, note when you left and came back, then listen for:

  • When it starts. Within minutes of you leaving points to distress.
  • What sets it off. A doorbell, footsteps, another dog. Barking with a clear trigger is a different problem.
  • How it sounds. Steady or frantic, on and off, howling or whining.
  • When it stops. Does it settle after a while, or carry on until you are back?

On an iPhone, DogQuiet does the listening for you. Leave it open and plugged in near your dog, and it logs each bark with the time, how long it lasted and a short clip, and notes what came just before it, like the doorbell. You come home to a timeline you can play back and show your vet.

DogQuiet also answers barking with a short sound. That can suit barking at a trigger, but it is the wrong tool for a dog that is anxious alone. If you think that is your dog, use a plain recording, like a camera or a voice memo, instead.

What helps

If it looks like distress

  • Walk your dog before you go, and leave a long-lasting chew or a food toy.
  • Keep absences short while you work on it. A dog sitter, a walker or a friend can break up a long day.
  • Don’t leave your dog to “cry it out”. The RSPCA says dogs left to do this learn that being alone is frightening.
  • Talk to your vet, who can refer you to a qualified behaviourist.

If it looks like boredom

  • More exercise and more to do every day.
  • A steady routine for meals, walks and play, at about the same times each day.

If something outside sets it off

  • Block the view: keep your dog away from front windows or the garden while you are out.
  • Brisbane City Council’s advice is to find the trigger and reduce it, then ask a vet or trainer if that isn’t enough.

Whatever the cause

Don’t punish it. The ASPCA puts it plainly: anxious behaviour is not disobedience or spite, and punishment can make it much worse.

When to see a vet or a behaviourist

  • See your vet if the barking is new, has got worse, or your dog seems unwell.
  • Ask for a referral to a behaviourist if it looks like distress, or nothing you try helps. In the UK, the ABTC lists clinical animal behaviourists, who work on referral from your vet. In the US, the ASPCA suggests a veterinary behaviorist or a Certified Applied Animal Behaviorist.
  • Medication is a vet’s call. Some dogs need it alongside training. Never give any without your vet.

Bring what you recorded. A week of times and clips tells a vet more than “he barks when I’m out”.

If a neighbour has complained

It is hard to hear, but they have heard what you couldn’t. Thank them, tell them what you are trying, and ask them to let you know when it happens. Official processes usually start gently: in New York City the owner first gets a letter with tips on curbing the noise, and Brisbane gives owners 28 days to resolve a complaint. See how barking complaints work where you live.

Common questions

Is it normal for a dog to bark when left alone?

It is common. The RSPCA says research suggests 8 out of 10 dogs find it hard to cope when left alone, and half show no obvious signs. Long or frantic barking soon after you leave is often distress, which can be prevented and treated.

How long can I leave my dog alone?

The RSPCA recommends no more than four hours for an adult dog, and much less for a puppy. A dog that struggles may feel anxious within minutes, so a dog sitter or walker can help on long days.

Should I tell my dog off when I get home?

No. The RSPCA and the ASPCA both advise against it. Your dog won’t link it to the barking, and the worry about you coming home can make the next time worse.

Will a deterrent sound help?

Not if the barking comes from distress: a frightened dog needs to feel safer, not to hear another unpleasant sound. For barking at the doorbell or passers-by, a sound can interrupt, but only nearby and in view. See do ultrasonic bark deterrents work?

Sources

  1. RSPCA. Separation anxiety in dogs. rspca.org.uk/adviceandwelfare/pets/dogs/behaviour/separationrelatedbehaviour
  2. RSPCA. How to stop your dog barking too much. rspca.org.uk/adviceandwelfare/pets/dogs/behaviour/barking
  3. ASPCA. Separation anxiety. aspca.org/pet-care/dog-care/common-dog-behavior-issues/separation-anxiety
  4. Animal Behaviour and Training Council. Types of practitioners. abtc.org.uk/owners/types-of-practitioners/
  5. Brisbane City Council. Animal noise complaints. brisbane.qld.gov.au/animals-and-pets/animal-fines-and-complaints/animal-noise-complaints
  6. NYC311. Noise from Dog or Other Animal. portal.311.nyc.gov/article/?kanumber=KA-01087