Noisy Breathing in Dogs: A Symptom Guide for Brachycephalic Breeds

Guide to noisy breathing in brachycephalic dogs: normal sounds vs warning signs, stertor vs stridor, BOAS assessment, home checks, and when surgery may be needed.

Quick Assessment

• Is this an emergency?

• Most common cause: Brachycephalic Obstructive Airway Syndrome (BOAS) — anatomical crowding of the nose, soft palate and larynx common in flat-faced breeds.
• When to see a vet: increased frequency or loudness of noisy breathing, exercise/heat intolerance, rapid resting respiration (>40 breaths/min), coughing or gagging with activity, or any change that affects activity level or sleep.

What this symptom looks like

Owners of brachycephalic breeds (English bulldogs, French bulldogs, pugs, Boston terriers, etc.) often notice: repeated snorting, snoring, snuffling, loud inhalations, or intermittent high-pitched breathing when excited or sleeping. That can be normal for these breeds. Worry arises when the noise is accompanied by labored effort, open-mouth breathing at rest, blue or pale gums, collapse, or a rapid decline in tolerance for exercise or heat.

Common sounds and what owners usually hear:

• Stertor: low-pitched snoring or snorting, often during inspiration and sleep.
• Stridor: high-pitched, wheeze-like noise, usually on inspiration — more suggestive of upper airway narrowing at the larynx or trachea.
• Reverse sneezing: rapid noisy inhalations in paroxysms — usually benign but can be scary.

Key definitions: stertor vs stridor

• Stertor: a low-pitched snoring/rasping sound caused by vibration of soft tissues in the nasal passages, pharynx or soft palate. Common in brachycephalics.
• Stridor: a high-pitched, harsh sound caused by turbulent airflow through a narrowed larynx or trachea. It usually signals more significant upper airway obstruction and is more likely to be urgent.

Possible causes (ranked by likelihood for brachycephalic dogs)

(Primary references: Merck Veterinary Manual: Brachycephalic Airway Syndrome; Royal Veterinary College BOAS resources.)

Decision tree: common presentations and actions

• If noisy breathing but dog is bright, eating, sleeping, and only makes noise when excited or asleep → likely mild BOAS or normal breed noise → Schedule vet check if noise increases or exercise tolerance falls.

• If noisy breathing + exercise or heat intolerance, increased panting, or resting respiratory rate > 40 breaths/min → likely moderate BOAS or progressive obstruction → See your vet within 48–72 hours; avoid heat/exertion.

• If noisy breathing + high-pitched inspiratory wheeze (stridor), increased work of breathing, open‑mouth breathing at rest, pale/blue gums, collapse or fainting → likely significant upper airway obstruction (severe BOAS, laryngeal collapse, acute obstruction) → Emergency vet now.

• If noisy breathing + sudden onset after foreign body exposure or trauma → likely acute obstruction → Emergency vet now.

Home assessment steps (what to check and how to measure)

When it’s an emergency — clear red flags

Seek immediate emergency veterinary care if any of the following occur:

• Marked difficulty breathing (open-mouth breathing while at rest, gasping, or severe effort)
• Collapse, fainting, or seizures
• Blue or gray mucous membranes (lips, gums, tongue)
• Uncontrolled bleeding or throat swelling after trauma or bite
• Rectal temperature ≥ 104°F (40°C) or signs of heatstroke (drooling, vomiting, disorientation)
• Sudden severe stridor or choking that does not quickly resolve

When to schedule a vet visit (non‑urgent but needed)

Make a routine appointment within days to weeks if your dog has:

• Chronic noisy breathing that seems to be worsening (louder, more frequent, or present at rest)
• Increased snorting, gagging, or frequent reverse sneezing episodes
• Reduced exercise tolerance or needing more rest on short walks
• Sleep disturbed by loud breathing or disrupted sleep patterns
• Intermittent coughing, gagging, or regurgitation with noises

BOAS assessment — what your vet will evaluate

Veterinarians assess BOAS with a combination of:

• History and physical exam (nares, soft palate length, laryngeal collapse)
• Functional grading (e.g., RVC BOAS grading scale: Grade 0–3 from no clinical signs to severe)
• Exercise tolerance tests (in‑clinic walk/treadmill tests)
• Diagnostic imaging: skull/nasal radiographs, cervical radiographs, chest radiographs
• Sedated upper airway exam or laryngoscopy
• Pre‑anaesthetic bloodwork, ECG, and chest x‑rays if surgery is being considered

When surgical intervention may be needed

Surgery is considered when anatomic obstruction causes significant clinical signs that reduce quality of life or pose risks (recurrent collapse, cyanosis, inability to exercise, or failure to respond to conservative measures). Typical surgical procedures include:

• Wedge rhinoplasty or alarplasty to widen stenotic nares
• Resection of elongated or redundant soft palate (staphylectomy)
• Removal of everted laryngeal saccules (sacculectomy)
• Procedures for advanced laryngeal collapse or tracheal issues (depends on case)

• BOAS grade 2–3 (moderate to severe) on functional assessment
• Recurrent heat- or exercise-related collapse or near-collapse
• Persistent open-mouth breathing and poor quality of life

Reference: Merck Veterinary Manual — Brachycephalic Airway Syndrome; RVC BOAS resources.

Home care while monitoring

• Keep your dog cool and calm; avoid exercise and heat exposure.
• Use a harness rather than a neck collar to reduce airway pressure during walks.
• Maintain a healthy weight — even modest weight loss can improve breathing.
• Avoid sedatives unless prescribed — they can depress respiration and worsen obstruction.
• Offer water and a quiet, cool place to rest.
• Short, calm walks rather than vigorous activity; monitor RR and effort.
• Steam from a bathroom (hot shower, door closed) may help transient nasal congestion in mild cases — only if the dog tolerates it and is not in distress.

What to tell your vet (prepare this before arrival)

• When the noisy breathing started and whether it has changed (hours, days, months)
• Character of the noise: low-pitched snore (stertor) vs high-pitched wheeze (stridor), inspiration vs expiration
• Frequency and triggers: sleep, exercise, heat, excitement, eating
• Resting respiratory rate (breaths per minute) and any episodes of collapse or fainting
• Color of gums/tongue during episodes (pink, pale, blue)
• Body temperature if checked
• Any medications, supplements, or previous airway surgeries
• Videos of the noise/episodes — very helpful
• Breed, age, weight, and recent changes in activity or appetite

Practical notes and expectations

• Many brachycephalic dogs have lifelong noisy breathing. The goal of veterinary care is to identify when noise reflects pathologic obstruction versus expected conformation, improve quality of life and reduce risk of emergency events.
• Early assessment and appropriate surgical correction in moderate cases often reduces long‑term complications and emergency incidents. However, surgery is not a guarantee and carries risks.
• Owners should expect veterinarians to discuss anesthesia risk mitigation, post‑operative airway swelling management, and staged procedures if multiple corrections are needed.

Sources

• Merck Veterinary Manual — Brachycephalic Airway Syndrome: https://www.merckvetmanual.com/respiratory-system/respiratory-diseases-of-dogs/brachycephalic-airway-syndrome
• Royal Veterinary College (RVC) — BOAS resources and functional grading: https://www.rvc.ac.uk/review/what-is-boas

If you’re unsure whether your dog’s noisy breathing is “normal” for their breed, a video plus a resting respiratory rate and a brief history will let your veterinarian give timely, practical advice. When in doubt and especially if your dog is struggling to breathe, seek emergency care right away.

Frequently Asked Questions