Guide · Dogs · Updated 25 September 2026
Why is my dog barking?
Most barking is a dog warning you about something, asking you for something, or letting off a feeling with nowhere else to go. You can usually tell which by looking at what happened just before, listening to the bark itself, and watching the rest of your dog.
Start with the moment, not the sound
The ASPCA's advice on problem barking starts in the same place, with working out why before you try to change anything. For three days, write each bout of barking down in one line. The time, what set it off, and what happened straight after. It ends up looking something like this:
11:20 · mail carrier at the gate · barked until she walked off
18:05 · I opened the fridge · barked at me, got a corner of cheese
02:40 · no idea · standing at the back door, ears up
The last column is the one that matters. Humane World for Animals puts it plainly. A dog that keeps barking in a situation is getting something out of it. From the dog's side, the mail carrier left because of the barking, and the cheese arrived on cue. Neither habit will fade by itself.
What the bark itself carries
Barks aren't words, but they aren't noise either. In a 2005 study from Eötvös Loránd University in Budapest, people listened to recorded barks and sorted them by situation (a stranger arriving, a dog left alone, a walk about to start, and so on) far better than chance. Owning a dog made almost no difference. How emotional a bark sounded to them tracked its pitch and the gaps between barks.
So, as a rough guide rather than a rule:
- Low, harsh barks in a fast run tend to go with warning something off: a stranger at the fence, a dog passing the window.
- Higher, clearer barks with gaps between them tend to go with wanting something or feeling uneasy, like being shut out of the bedroom or watching the ball roll under the sofa.
- High, bouncy barks with play bows and zoomies are almost always play.
Your dog has their own version of each. After a week of keeping the log, most people can tell the doorbell bark from the "you have toast and I don't" bark without looking up.
The common barks, and what usually helps
| Bark | What you'll often see | What tends to help |
|---|---|---|
| Alert or territorial | At the window, gate or door, at people and dogs going past. Stiff body, leaning forward, often from the same lookout spot. | Block the view with frosted film on the lower glass, a closed door or a curtain. Reward your dog for coming away from the window, ideally before the barking starts. |
| Alarm | At sudden sounds or sights anywhere, not only at home. | Distance first. Pair the scary thing with food at a distance your dog can cope with, and move closer slowly over days. |
| Demand | At you, looking at you, often at the same time each day. Stops the second you respond. | Stop paying for it. Wait for a second of quiet, then give the walk, food or attention. It usually gets louder for a few days before it fades. The RSPCA also suggests meals, play and exercise at about the same times every day, so there's less to ask for. |
| Greeting | Loose body, wagging, maybe whining, when people arrive. | Keep greetings low-key. Teach a sit-and-stay, or "go to your mat", as the way to say hello, and practise it before anyone is at the door. |
| Frustration | Behind a gate, on the lead, watching other dogs play. | Keep the waits short and the distance bigger. A chew or a handful of kibble scattered in the grass gives them something else to do. |
| Joining in | Only when other dogs in the street start up. | Bring your dog in when the street starts up, put music on to cover it, and reward them for turning back to you. |
| Left alone | Only while you're out, often with pacing, scratching at doors, or accidents indoors. | This isn't a be-quiet training problem. Read the ASPCA's separation anxiety guide and talk to your vet. |
| Pain | New barking or a yelp when touched, getting up, or jumping. | Vet first. The ASPCA asks owners to rule out a medical cause before working on any barking problem. |
"Why is my dog barking at nothing?"
It's usually something you can't hear. Dogs pick up higher and fainter sounds than we do, so the neighbour's gate latch or a fox crossing the lawn at 2 a.m. is plenty. Watch where the ears and nose point. If it's always the same window at the same hour, it's probably the same thing every time.
New barking at night in an older dog is a different case. The ASPCA's guide to older dogs notes that hearing loss can make a dog more anxious and vocal, and lists age-related changes in the brain (cognitive dysfunction) among the causes of new behaviour in senior dogs. Both are worth a vet visit before any training plan.
What not to do
Yelling "quiet!" doesn't reduce barking, as Humane World for Animals notes. Punishment can backfire too. The ASPCA points out that a dog guarding its territory stays just as motivated when scolded, and may switch to other ways of guarding, including biting without warning. The ASPCA calls anti-bark collars (shock, spray or noise) punishment devices and doesn't recommend them as a first choice, least of all for barking driven by fear or anxiety. Our app only teaches force-free methods, because a collar goes after the noise and leaves the cause where it was.
When to call the vet or a behaviour professional
- The barking changed suddenly, or came with a new yelp when your dog is touched, stands up or jumps.
- An older dog has started barking, pacing or wandering at night.
- Your dog barks, howls or wrecks things only when left alone.
- The barking comes with growling, lunging or snapping at people or other dogs.
Start with your vet. For behaviour help, look for a veterinary behaviourist (in the US, a board-certified DACVB) or a certified trainer who uses reward-based methods, such as a CPDT-KA.
Can an app tell you what a bark means?
Partly, and it's worth being exact about how much. In a 2008 study, researchers trained software on more than 6,000 barks recorded in six situations. Given barks it hadn't heard before, it named the right situation 43% of the time, where guessing would get about 17%. So there's real information in the sound. Newer research has improved on those numbers, but it's still sorting barks into a handful of situations. Nobody is decoding sentences.
Barkly, the app we make, works inside that honest range. Tap Listen when your dog barks and it shows the mood the sound most likely carries (alert, let's play, lonely, demanding attention, or relaxed and content), how sure it is, and which parts of the sound it went on: pitch, how clear or harsh it was, how fast the barks came. The listening happens on your iPhone, and the recording isn't uploaded. Answer "Yes" or "Not really" after a read, and it starts comparing new barks with your own dog's. It can't see the mail carrier and it can't examine your dog, so your log and your vet still do the heavy lifting.
Free to download for iPhone, with three mood reads a day. No ads.
Sources
- ASPCA, Barking
- ASPCA, Separation Anxiety
- ASPCA, Behavior Problems in Older Dogs
- RSPCA, Dog barking
- Humane World for Animals, How to get your dog to stop barking
- Pongrácz, Molnár, Miklósi and Csányi (2005), Human listeners are able to classify dog barks recorded in different situations, Journal of Comparative Psychology
- Molnár and colleagues (2008), Classification of dog barks: a machine learning approach, Animal Cognition
This guide is general information, not veterinary advice. If you're worried about your dog, call your vet.