Your dog is reacting to something outside your senses — a sound above your hearing, a noise too far off, a smell — or to something inside it: boredom, frustration, old-age confusion. Find out which with a three-day log: time, room, direction faced, what happened before, what ended it. New, nightly or senior barking goes to a vet first.
The first thing to accept is that your ears are the weak link. Published figures for the top of a dog's range vary by source: Louisiana State University's veterinary hearing tables put it at roughly 67 to 45,000 Hz against 64 to 23,000 Hz for a human, while the American Kennel Club quotes 47,000 to 65,000 Hz. The disagreement is about the ceiling, not the gap. Everything in that gap - the whine of a switching power supply, an ultrasonic pest repeller, a motion sensor, a mouse behind plasterboard - is a real event for your dog and a blank wall for you.
Direction is the second trap. The American Kennel Club notes that humans can separate two sound sources about one degree apart, while dogs need around eight degrees. Your dog is far better at hearing a sound and noticeably worse at pointing at it, so a dog barking at an empty corner may be responding to something quite real on the other side of the room, or outside the house entirely.
Not every bark is about the outside world. The ASPCA's behaviour material separates territorial, alarm, attention-seeking, greeting, compulsive, socially facilitated and frustration-induced barking, and VCA's veterinary write-up adds medical causes, particularly in older dogs. So barking at nothing really splits into three buckets: something you cannot detect, something in the dog's routine that keeps paying off, and something in the dog's body.
For every episode write five things: clock time, which room, which way the dog was facing, what was happening in the thirty seconds before, and what made it stop. Add one word for how it sounded - deep, sharp, whiny, drawn out. This is not busywork: a behavioural history is the first thing a vet or trainer asks for, and VCA's guidance says exactly that. Without it, an episode you half-remember at 3 a.m. becomes he barks at nothing, when the log would have shown it happens every night within the same fifteen minutes.
Outward-facing episodes point at a door, window or wall, and the ASPCA describes alarm barking as coming with a stiffer body and forward movement on each bark - that is a trigger you have not found yet. Episodes aimed at you, which stop the instant you look up, speak, feed or open a crate, are attention-seeking or frustration barking, and the trigger is the payoff. Episodes with no direction at all, especially at night and mixed with pacing or getting stuck in corners, go in the medical bucket and stay there.
Change a single variable each night and watch the log. Unplug ultrasonic pest repellers. Pull power on standby electronics in the room he faces. Switch off motion-sensor lights outside that window. Close the window on the side he barks toward. Run a fan to mask distant sound. If the barking stops on the night you remove one suspect and returns when you restore it, you have your answer without ever hearing the noise yourself. Test one thing at a time or you will learn nothing.
For outward-facing barking, cut the sight line: frosted film on the lower half of the window, a closed curtain, moving the bed or crate away from the front door. A dog that cannot see the postman rehearses the routine less often. For at-you barking, the ASPCA's advice is to stop rewarding it consistently, and note that scolding counts as a reward because it is attention. Wait for a gap of silence, ask for a sit, then give what he was asking for. Add a walk or a chewing session before the hour your log says is worst.
The ASPCA is blunt about the order of operations: before you try to resolve a barking problem, have your dog examined to rule out medical causes. Pain, fading eyesight or hearing, and age-related cognitive decline all surface as barking with no visible target, usually together with pacing, a flipped sleep schedule and disorientation. A dated log of times and patterns is worth far more in a ten-minute consult than a description of how the barking sounds.
This page was written by DKsequence. We also make the Android app recommended below — the steps above work whether or not you install it.
Something usually is, just not on that wall. Dogs pinpoint direction far more coarsely than we do - the AKC puts human resolution at about one degree and a dog's at roughly eight - so a dog reacting to a water pipe, a neighbour's television or a rodent in a cavity often faces the wrong spot. Add a hearing ceiling that published sources put somewhere between 45,000 and 65,000 Hz, and nothing simply means the part of the room you cannot audit. The exception worth taking seriously: an older dog doing this repeatedly at night, with pacing and disorientation, should be seen by a vet.
Two reasons. Ambient noise drops after dark, so distant sounds that were masked all day suddenly carry, and the sources that stay active at night - heating pipes, wildlife, motion-sensor lights - are the ones you are least likely to notice. The second reason is medical: night barking that is new in a senior dog, together with a flipped sleep schedule, is one of the patterns vets ask about. Log the times before you assume it is boredom.
No, and for attention-seeking barking it usually backfires. Any response is attention, scolding included, so shouting teaches the dog that barking reliably produces you. The ASPCA's approach is the reverse: withhold the reward every single time, then the moment he goes quiet, ask for a sit and give him what he wanted. Being inconsistent is worse than doing nothing, because an occasional payoff is exactly what makes a habit stubborn.
It is worth testing, because those devices work in exactly the band your dog hears and you do not. Unplug one suspect for a full evening, keep everything else the same, and compare the log with the previous night. Switching power supplies, some LED drivers, motion sensors and cheap chargers can all emit a steady high tone. If removing a device quiets the barking two nights running and restoring it brings the barking back, that is as close to proof as you will get.
No, and it has its own name. The ASPCA lists socially facilitated barking as a category of its own: some dogs bark excessively only when they hear other dogs barking. Management beats training here - mask the sound with a fan, move his resting spot to the quiet side of the house, and avoid leaving him where the neighbourhood chorus starts up at the same time each day.