Frenchie BOAS and Breathing Care: A Sitter's Guide

"Flat-faced" undersells what's actually going on with a French Bulldog's breathing. The formal name is brachycephalic obstructive airway syndrome, BOAS for short, and it covers a handful of airway traits (narrow nostrils, an elongated soft palate, a narrowed windpipe) that can, in combination, make moving air harder than it looks from the outside. Some Frenchies breathe easily their whole lives. Others work at it, quietly, every day. Neither is a mystery you need to solve yourself; it's a picture the owner already has, and this guide is about reading it correctly during a stay.

Snoring is not the same as struggling

Nearly every French Bulldog snores and snorts, awake and asleep, and that alone doesn't mean anything is wrong. What matters for a sitter is the dog's baseline: how they sound after a normal walk, at rest on the couch, on a warm afternoon. Ask the owner to describe it in plain terms at drop-off, the same way you'd ask about any dog's normal. A Frenchie who's noisy but recovers quickly and eats and plays normally is being a Frenchie. One who's noisier than the owner described, or who takes longer than usual to settle after activity, is worth a check-in call.

Vets who assess BOAS formally don't rely on snoring alone either. The Kennel Club's Respiratory Function Grading Scheme and the equivalent program administered through the OFA grade dogs on a 0–3 scale: a specially trained veterinarian listens to the dog's breathing with a stethoscope before and after a short exercise walk, grading from grade 0 (no respiratory signs) and grade 1 (mild signs, both considered clinically unaffected) up to grades 2 and 3 (moderate to severe signs, considered clinically affected). The scheme grew out of the University of Cambridge's BOAS research group, which has studied airway function in the breed for over a decade. If an owner mentions their dog has been graded, that's useful context, but the grading itself is a vet's call, not something a sitter assesses or needs to interpret.

What a sitter can actually watch for

You don't need to be able to name the anatomy. You need three things: the owner's description of normal, a few minutes of quiet observation at drop-off, and a habit of checking in during warm weather or after exercise.

• Normal: audible snoring/snorting at rest, some noise after play that settles within a few minutes, needing a slower pace than a non-brachycephalic dog on a walk.
• Worth a call to the owner: breathing that's noticeably louder or more effortful than the baseline they described, retching or gagging that's new, more reluctance to walk or play than usual, or slower-than-usual recovery after activity.
• Get to the nearest emergency vet now, then call the owner: open-mouth breathing at rest, blue or gray gums or tongue, collapse, or any point where the dog seems to be working hard to breathe and isn't improving with rest in a cool space. Trust your read of "this looks like real distress" over any checklist; act first, explain after.

Pairing this with heat and exercise

BOAS and heat tolerance are closely linked; a dog that works harder to move air also has a harder time cooling itself by panting. That's the whole reason airway status and heat planning travel together for this breed, and it's worth reading the heat plan guide alongside this one rather than treating them as separate topics. In practice: shorter, slower walks in the cool parts of the day, real rest breaks, and never pushing a dog past what they're telling you they want to do, regardless of how far you'd planned to walk.

Before the stay

Ask the owner directly: is this a quieter or a noisier Frenchie than average, has a vet ever mentioned anything about their airway, and is there anything specific that's ever worried them (a recent trip, a hot day, a bout of overexcitement)? Their answer sets your baseline better than any general description of the breed could.

FAQ

Does every French Bulldog have BOAS?

Not necessarily as a clinical diagnosis, but the underlying anatomy that makes BOAS possible is common across the breed to varying degrees. That's why the French Bull Dog Club of America points owners toward respiratory screening resources rather than treating it as an all-or-nothing label.

Should I limit exercise for every Frenchie, just in case?

Match the owner's stated normal rather than guessing at a universal rule. A dog whose owner describes an easygoing, energetic routine doesn't need you inventing restrictions; a dog whose owner flags a more careful routine deserves you following it exactly.

What if the owner didn't mention anything about breathing at drop-off?

Ask anyway, the same way you'd confirm any other care detail. Most owners are used to describing this, and a thirty-second conversation is worth far more than assuming "no mention" means "no concern."

Pair this guide with the medication routine guide if the dog you're hosting is on any related medication, and read the meet-and-greet checklist for how to work through baseline questions like these in person before a stay begins.