Article

By Filip Kowalski · Published September 12, 2026

White noise for dogs: what it masks, and what it can't fix

You do not need a white noise machine for dogs: Slo plays the same masking noise free in a browser tab at slonoise.com, on iPhone, Android or Mac, with a timer and the colour you pick — brown noise to cover low outdoor rumble like fireworks and traffic, white noise to cover higher sounds like the doorbell, keys and voices. Masking changes what your dog can hear. It does not change how your dog feels about it, and a dog with a noise phobia or a separation problem needs a vet or a qualified behaviourist rather than a louder speaker.

Where sound is the wrong tool

Stefanie Riemer’s survey of 1,225 owners of firework-fearful dogs is the largest piece of evidence anyone has on what actually helps with that specific fear; see the fireworks plan for the figures and for what didn’t help.

Background sound is a comfort measure, and comfort measures are the part of the toolkit with the least support behind it. If your dog panics, drools, hides or destroys things during fireworks or when you leave the house, that is noise phobia or separation distress, and the American Veterinary Society of Animal Behavior says treating it “often requires the assistance of a Certified Applied Animal Behaviorist or veterinary behaviorist”. An app is not that. Slo is a player with a volume slider and a timer.

What masking is genuinely for: a dog that startles at the neighbour’s door, a puppy whose first nights are full of unfamiliar building noises, a flat on a busy road. Blur the trigger and there is less to react to.

Which colour covers which noise

Masking works when the covering sound sits in the same frequency band as the thing you want covered, at a similar level. That makes the choice of colour a question about the trigger, not about the dog.

Colour	Spectrum	Sits well over
Brown	−6 dB per octave	Fireworks thumps, lorries, a bass line through a wall, the washing machine downstairs
Pink	−3 dB per octave	A general outdoor background — traffic, wind, rain on a road
White	Flat per hertz	Doorbells, keys, footsteps on stairs, voices in the hallway

Brown noise is the usual starting point for anything coming from outside, because outdoor noise arrives through walls and windows with its treble already stripped off. What reaches the dog is the low end, and brown noise is where the low end is. White noise is the better answer indoors, where the triggers are sharp and short.

Two things the table does not decide for you. Your speaker has to be able to produce the bass for brown noise to be worth choosing — a phone speaker on a kitchen counter reproduces very little below 200 Hz, so brown noise from it is mostly the quiet part of brown noise. And your dog may simply prefer one over another, in the ordinary sense of settling more readily with it on. Try each for a few evenings before deciding.

Pink noise is the compromise when you cannot pick. By construction it sits between the two.

Three settings that decide whether it works

Volume, set against the trigger and not against the room. The level has to be enough to blur the trigger at the spot where the dog lies, which is usually lower than people expect, because the dog is closer to the floor and further from the speaker than you are when you set it. Two checks: you should be able to talk over it without raising your voice, and you should still hear the doorbell. Remember the hearing gap — the LSU School of Veterinary Medicine puts a dog’s range at roughly 67 to 45,000 Hz against 64 to 23,000 Hz for a person. The hiss you can barely hear is not barely audible to your dog.

Placement, between the dog and the wall the noise comes through. Put the speaker on the window side or the party-wall side of the room, not next to the bed or the crate. You are trying to raise the noise floor along the path the trigger takes, and a speaker parked by the dog’s head just makes a loud thing near the dog’s head.

Timing: before, not during. Start it hours ahead — the afternoon before fireworks night, an hour before you leave the house, when the puppy goes into the room for the evening rather than when it starts crying. Sound that switches on the moment something frightening happens becomes part of the frightening thing. Sound that has been on since teatime is furniture.

The timer matters here too. If you want the noise through the night, run it through the night; if you only want cover for the first hour after you leave, set an hour. Both are reasonable. Guessing every time is not.

Four situations people arrive with

Fireworks and thunder. This is the one where masking does least, because the peaks are far louder than anything a domestic speaker can cover, and the vibration comes through the floor as well as the air. Brown noise takes the edge off the mid-distance thumps. It will not cover a firework going off in the street, and if your dog is genuinely phobic, book the vet in November rather than testing an app on the thirty-first. For the fuller plan — what to do in the weeks before a known display and on the night itself — see how to calm a dog during fireworks.

A dog that reacts to the corridor. Deliveries, the lift, the neighbour’s door. White noise, in the hallway rather than in the living room, quiet. The gain here is real and cheap: fewer of these sounds arrive as distinct events.

Left alone. Steady sound makes an empty flat less silent, which means the sounds from outside stand out less against it. That is the whole mechanism, and it is worth doing. It is also not a treatment for separation anxiety: no track helps a dog that cannot cope with being alone, and leaving one running to avoid facing that is the trap. Layer two quiet sounds if a single flat tone bothers you, for example rain over brown noise.

A puppy’s first nights. A new house is loud in ways nobody living there notices any more: the boiler, the fridge, a car door at midnight. A low steady background flattens the differences between them. Start it the first night, keep it the same, and change one thing at a time if it is not working.

Questions people ask

Is white noise safe for a dog?

At a low level, yes, with one caveat: dogs hear up to about 45,000 Hz where people stop near 23,000 Hz, so the hiss carries further for them than it does for you. Set it quieter than feels right, and let the dog leave the room if it wants to.

White noise or brown noise for a dog?

Match the trigger. Brown noise puts most of its energy low, which is where fireworks thumps and traffic rumble live. White noise is flat per hertz, so it has more high-frequency content and covers doorbells, keys and voices better.

Do I need a white noise machine for a dog?

No. A machine is a speaker with a dial. The same noise plays free in a browser tab or from a phone, and a phone gives you a timer and a volume slider that a hardware dial does not.

Will it stop my dog barking at the doorbell?

It can make the doorbell harder to hear, which sometimes means fewer barks. It does not change what the doorbell means to your dog. If the barking is the problem rather than the noise, that is training work.

Sources

Riemer, S. (2020). Effectiveness of treatments for firework fears in dogs, Journal of Veterinary Behavior 37, 61–70. Survey of 1,225 owners; the open preprint carries the full figures.
American Veterinary Society of Animal Behavior, A dog’s least favorite holiday, on desensitisation, counterconditioning, and when to involve a veterinary behaviourist.
Louisiana State University School of Veterinary Medicine, hearing ranges by species.