French Bulldog Breathing Problems (BOAS): Signs, Heat and When to Worry

The flat face is the whole breed, and the whole problem. A French Bulldog has a normal-sized airway folded into a very short skull: narrow nostrils, a long soft palate, a small windpipe. Most have some degree of brachycephalic obstructive airway syndrome, BOAS, and it is graded from barely-there to life-limiting. Knowing where your dog sits on that scale changes how you walk them, feed them and get through summer.

The usual honest line: we are not vets. This is what to watch and when to ask.

What normal should sound like

Quiet breathing at rest, mouth closed, in a cool room. Some snoring asleep is common in the breed. What is not normal: noisy breathing while awake and resting, panting for a long time after mild exercise, gagging, retching or bringing up foam, sleeping sitting up or with a toy in the mouth to keep the airway open, and any blue or purple tinge to the gums or tongue.

Ask for a grade

Many vets now grade BOAS from 0 to 3, some with a short exercise test. A grade tells you whether your dog is fine, needs managing, or needs surgery. Surgery to widen the nostrils and shorten the soft palate helps many dogs enormously, and done young it can stop the airway getting worse. It is not a cure for the breed, but it is often the difference between a dog who copes and a dog who struggles.

Heat: the real danger

Dogs cool themselves by panting. A Frenchie's panting is inefficient, so on a warm day the effort of panting heats them up, and the spiral is fast. Heatstroke kills French Bulldogs every summer, often on ordinary walks.

• Walk early or late, never in the heat of the day. Watch humidity as much as temperature; a humid 22°C can be worse than a dry 28°C.
• Shade and water always. No hot cars, not for a minute.
• A cooling mat at home, a fan, closed curtains in the afternoon.
• Stop the walk the moment panting gets noisy. Carry a small dog home if you must.

Heatstroke signs: heavy panting that won't settle, thick drool, bright red or dark gums, wobbling, vomiting, collapse. Cool with tepid, not icy, water on the belly, armpits and paws, get air moving, and get to a vet immediately. Cool on the way; don't wait to cool first.

Exercise that works

Short, frequent and cool beats long and hot. Two or three walks of twenty minutes, sniffing allowed, is a good adult day. No fetch marathons, no running in the sun, and no swimming without a life jacket and a hand on the dog: most Frenchies can't swim.

The knock-on effects

Airway pressure causes reflux and regurgitation, which is why so many Frenchies bring food up. Smaller meals, a raised slow bowl and no exercise straight after eating help. Anaesthesia carries more risk for flat-faced dogs, so choose a vet who works with brachycephalic breeds routinely. And weight matters more than anything: every extra kilo makes the breathing harder. Our health by age guide covers when to ask about all of this.