Wildfire smoke affects dogs and cats more than most owners expect, because they breathe faster than we do and live closer to the ground where fine particles settle. Coughing, wheezing, watery eyes, low energy and reduced appetite are common. Any open-mouth breathing in a cat is urgent and needs same-day veterinary attention.
Why the Fraser Valley holds onto smoke
Late August and September are the weeks when the sky over East Abbotsford turns that flat, coppery colour and the hills behind McMillan Road disappear. The smoke is rarely ours. It drifts in from fires burning in the Interior, in Washington State, or further north, and then it stops moving.
The geography is the reason. The valley floor sits low between the Coast Mountains on one side and Sumas Mountain and the border ranges on the other, so when a warm, stagnant air mass parks overhead, smoke settles into the bowl and stays there for days. Anyone who has driven the Sumas Prairie flats on a smoky morning has seen the layer sitting like a lid.
That persistence is what makes this a pet health issue rather than a scenery issue. A single hazy afternoon means very little. A week of poor air, with the household windows shut and the dog still expecting two walks a day, is what brings coughing pets into the clinic.
Why fine particles reach further in a dog or cat
The component of wildfire smoke that matters clinically is fine particulate matter, the fraction small enough to travel past the nose and throat and reach the deep airways. Pets are more exposed to it than their people for three plain reasons.
- They breathe faster. A resting dog takes roughly two to three times as many breaths per minute as an adult human, and a cat more again, so more air moves through those airways every hour.
- They live at ankle height. Particles and settled ash concentrate near the ground, which is exactly where a Beagle’s nose spends its day and where a cat sleeps.
- They cannot opt out. You can shorten your own errands. Your dog goes where the leash goes, and an outdoor cat has no way to read an advisory.
Add the grooming factor for cats. Ash that lands on a coat gets swallowed during grooming rather than brushed off, which is a route of exposure dogs largely skip.
Which pets in the neighbourhood are most at risk
Healthy young adult dogs and cats usually ride out a smoke episode with nothing worse than tired eyes. Certain patients do not, and these are the ones we would rather see early than late.
- Flat-faced, or brachycephalic, breeds. French Bulldogs, Pugs, Boston Terriers, Shih Tzus, Boxers and Persian cats already work harder to move air through a shortened airway, so poor air quality removes a safety margin they never had much of.
- Cats with feline asthma or a history of chronic bronchitis. Smoke is a well recognized trigger for airway narrowing, and a cat who has been stable for months can flare during an advisory.
- Senior dogs and cats, especially those with a heart murmur, diagnosed heart disease, a chronic cough or collapsing trachea.
- Puppies and kittens, whose airways are still developing and who tend to play flat out regardless of what the air is doing.
- Overweight pets, who carry extra respiratory work before smoke is added to the picture.
If your pet sits in more than one of those groups, it is worth a conversation with our team before the first advisory of the season rather than during it. Ongoing airway and cardiac concerns are managed through our medical services, and having a plan already written down takes a lot of pressure off a smoky week.
The signs to watch during a smoke advisory
Most smoke related signs are mild and settle when the air clears. Watch for changes from your own pet’s normal, not against some general standard.
- A new cough, a honking cough, or throat clearing that was not there last week
- Wheezing, raspy breathing, or noticeably faster breathing at rest
- Laboured breathing, obvious belly effort with each breath, or a stretched out neck and elbows held away from the body
- Open-mouth breathing or panting in a cat, which is never normal at rest
- Red, watery or squinting eyes, or pawing at the face
- Sneezing, nasal discharge, or a hoarse change in voice
- Lethargy, reluctance to walk, or backing out of games they usually love
- Reduced appetite, or drinking noticeably more or less than usual
- Gums that look pale, grey or bluish rather than healthy pink
Two of those deserve a separate line. A cat breathing with an open mouth, and any pet with grey or blue gums, should be seen straight away. Do not wait to see whether the air improves overnight. Our urgent care service covers exactly this kind of sudden respiratory concern during open hours, and phoning ahead lets the team be ready at the door.
Reshuffling the walk instead of cancelling it
Skipping exercise entirely for a week creates its own problems, so the practical answer is usually to move it rather than drop it.
- Shift walks to the coolest, clearest part of the day. Smoke often thins somewhat overnight and thickens through the afternoon, though this varies day to day.
- Cut the length and the intensity. A short lead walk on a quiet street off McMillan Road is a very different respiratory ask than a long loop around Mill Lake Park or a run on the Discovery Trail.
- Save the ball thrower for a clear week. Hard sprinting drives fast, deep breathing, which is the worst possible way to sample smoky air.
- Keep toilet breaks short and purposeful when the air is at its worst.
- Bring outdoor and indoor-outdoor cats inside for the duration and set up an extra litter box so they are not lobbying to get out.
- Wipe your pet’s face, eyes and coat with a damp cloth after they come in to lift settled ash before it is groomed off and swallowed.
Replace the missing physical outlet with mental work. Scatter feeding, snuffle mats, food puzzles, short training sessions, chew items and a rotation of a few toys will tire a bored dog surprisingly well, and cats respond to wand play and a cardboard box far more than the box deserves. Put out a second and third water bowl while you are at it, because smoky, dry air and heavier panting together raise what a pet loses through the airway over a day.
Cleaner air indoors
Keep windows and doors closed while an advisory is in effect, and run air conditioning on recirculate rather than drawing outside air in. A portable HEPA air cleaner sized for the room your pet sleeps in makes a genuine difference, and if you only have one, put it where the pet spends the night rather than in the living room.
Change your furnace filter before smoke season and upgrade it if your system takes a higher rated filter. Avoid adding indoor smoke of your own: candles, incense, wood stoves, aerosol sprays and frying without a hood all load the same air your pet is breathing. Vacuum with a HEPA equipped machine so settled ash is removed rather than stirred back up.
How to use the AQHI sensibly
The Air Quality Health Index is the national scale used across British Columbia, and it is a useful tool as long as you read it as a trend rather than a threshold. There is no single number at which pets become unsafe, and none of the published guidance is written for dogs and cats in the first place.
Use it three ways. Check the direction of travel, because a rising index through the afternoon tells you to bring the evening walk forward. Compare it against your own pet’s history, since an animal who coughed at a given level last September will likely cough there again. And treat any advisory as the cue to start watching your pet more closely, not as permission to relax if the number dips.
Your dog or cat is the better sensor. If they are coughing, sluggish or breathing harder on a day the index looks moderate, believe the pet.
When smoke exposure warrants an exam
Book an appointment if a cough persists more than a day or two after the air clears, if breathing effort has visibly changed, if a known asthmatic cat needs more rescue medication than usual, or if appetite and energy have not bounced back. Bring your senior or brachycephalic pet in sooner rather than later, since those patients have the least room to compensate.
An exam starts with listening to the chest and watching how your pet actually breathes. Depending on what we hear, chest imaging or bloodwork through our in-house pet diagnostics can separate smoke irritation from an underlying airway or heart condition that the smoke has simply uncovered. For pets with a known respiratory or cardiac history, a check-in built into our wellness program before smoke season is a better use of everyone’s time than a scramble in the middle of one.
Two related reads from our blog may help this time of year: our guide to hot pavement and paw pad burns, which covers the same walk timing decisions from a different angle, and our first year guide for puppies and kittens if you have a young pet facing their first smoky stretch.
Frequently asked questions
Is wildfire smoke actually dangerous for dogs and cats?
Yes, and the risk scales with the pet rather than the smoke alone. Fine particles reach the deep airways and cause irritation and inflammation, which a healthy young dog usually shrugs off within a day or two of clean air. Pets with existing airway disease, heart disease, a flat face, or many years behind them have far less reserve to draw on.
My cat is breathing with her mouth open. Is that an emergency?
Treat it as one. Cats do not pant to cool down the way dogs do, so open-mouth breathing at rest signals that a cat is working hard to move air, whatever the cause. Keep her calm, avoid handling her more than necessary, put her in a carrier gently, and phone us on the way so the team is expecting you.
Should I walk my dog at all when there is a smoke advisory?
Short, slow walks are usually reasonable for a healthy adult dog, while hard exercise is not. Aim for the clearest hours, keep it to toilet breaks and a gentle stroll, and turn back if you hear coughing or see effort in the breathing. Brachycephalic, senior and heart patients should stay in and do their exercise indoors.
Do dog masks or filters work for pets?
They are not a practical option. A mask only filters if it seals, and no seal is achievable across the range of muzzle shapes we see, quite apart from whether a dog would tolerate one. Filtered indoor air, shorter outdoor time and rest during the worst hours are the strategies that genuinely reduce exposure.
How long do signs last after the air clears?
Mild eye and throat irritation often eases within a day or two of clean air. A cough can hang on longer, particularly in pets with sensitive airways, and that lingering cough is the one worth having examined. If anything is getting worse rather than better after the smoke lifts, call us.
Concerned about your pet’s breathing? We are on McMillan Road
Breathing changes are the one thing we would never ask you to sit on. Our team can listen to your dog or cat’s chest, look at those irritated eyes, and tell you whether what you are seeing is smoke irritation or something that needs a closer look. Phone +1 (604) 852-3030 and describe what you are seeing, or book a same-day slot on our urgent care page.
Published by the team at Glenn Mountain Animal Hospital.
This article is provided for general educational purposes only and is not a substitute for an in-person veterinary exam, diagnosis or treatment. If you are worried about your pet right now, please contact Glenn Mountain Animal Hospital directly, or the nearest emergency veterinary hospital when we are closed.
Glenn Mountain Animal Hospital
#106-2596 McMillan Road, Abbotsford, BC V3G 1C4, Canada
Phone: +1 (604) 852-3030
Hours: Monday to Saturday: 8:00 AM to 8:00 PM
Sunday: 9:00 AM to 5:00 PM
Stat Holiday: 9:00 AM to 5:00 PM
Note: Hours may change