Brachycephalic Breeds: Health Risks Every Flat-Faced Dog Owner Should Know

Pugs, French bulldogs, English bulldogs, Boston terriers, Shih Tzus, and Cavalier King Charles spaniels are among the most popular dog breeds in the world. They are also among the most medically compromised. Their flat faces — technically known as brachycephaly — are not just a cosmetic trait. They are a structural deformity that causes chronic breathing difficulty, overheating, dental crowding, eye injuries, spinal problems, and shortened lifespans.

In 2025, the UK’s Crufts dog show introduced mandatory respiratory function grading for pugs, bulldogs, and French bulldogs, barring the most severely affected dogs from competition. Across the EU, new legislation now requires brachycephalic breeds to have muzzles of adequate length relative to skull size. These regulatory shifts reflect growing scientific and veterinary consensus that breeding dogs for extreme flat faces constitutes an animal welfare concern.

What Brachycephaly Does to a Dog’s Body

Brachycephalic obstructive airway syndrome (BOAS) is the most well-known consequence. The shortened skull compresses the airway structures without proportionally reducing the soft tissue, creating a series of obstructions.

Stenotic nares — The nostrils are often narrowed to slits, restricting airflow before it even enters the nasal passage.

Elongated soft palate — The soft palate extends too far into the throat, partially blocking the airway. This is what causes the characteristic snoring, snorting, and gagging sounds many owners describe as “cute” or “normal for the breed.”

Hypoplastic trachea — The windpipe is often narrower than it should be for the dog’s body size, further restricting oxygen flow.

Everted laryngeal saccules — Chronic airway obstruction can cause the tissue near the larynx to be sucked into the airway, making breathing even harder over time.

These are not minor inconveniences. Dogs with moderate to severe BOAS struggle to exercise, overheat rapidly, and in extreme cases can collapse or suffocate. If your dog regularly makes loud breathing sounds at rest, that is not breed character — it is a medical symptom. For guidance on recognizing respiratory distress, review our common dog health problems guide.

Beyond Breathing: The Full Health Picture

Brachycephaly affects virtually every body system.

Eyes — Shallow eye sockets mean the eyes protrude, increasing the risk of corneal ulcers, proptosis (the eye popping out of the socket), and chronic irritation from exposure. Breeds like pugs and Boston terriers are particularly vulnerable.

Teeth — A shortened jaw does not reduce the number of teeth. The result is severe dental crowding, misalignment, and a higher incidence of periodontal disease. Regular dental care is especially critical for these breeds.

Spine — Many brachycephalic breeds, particularly bulldogs and pugs, are prone to hemivertebrae — malformed spinal bones that can cause pain, weakness, and paralysis. French bulldogs have the highest rate of intervertebral disc disease of any breed.

Skin — The deep facial folds that give brachycephalic dogs their wrinkled appearance trap moisture and bacteria, leading to chronic skin fold dermatitis that requires daily cleaning to prevent infection.

Thermoregulation — Dogs cool themselves primarily by panting, which requires efficient airflow through the nasal passages. Brachycephalic dogs cannot pant effectively, making them dangerously susceptible to heat stroke. Even moderate temperatures can be life-threatening.

The Regulatory Response

The UK Brachycephalic Working Group, the British Veterinary Association (BVA), and veterinary organizations worldwide are pushing for stronger regulations. In 2025, the BVA published updated policy calling for mandatory health testing for all brachycephalic breeding stock, advertising restrictions, and veterinary reporting requirements.

A legal analysis published by the UK advisory group concluded that owners who breed from moderately or severely brachycephalic dogs may be committing animal welfare offences under existing law. In the Netherlands, breeding of dogs with muzzles shorter than one-third of skull length has been effectively banned since 2023.

Four of the UK’s ten most popular dog breeds are now brachycephalic, according to Pets4Homes data. The popularity of these breeds continues to rise even as veterinary warnings intensify, driven partly by social media exposure and celebrity ownership.

What Responsible Owners Can Do

If you already own a brachycephalic breed, you can take steps to manage their health proactively.

Get a BOAS assessment — Ask your veterinarian to evaluate your dog’s airway. Mild cases can often be managed conservatively; severe cases may benefit from surgical correction, which typically involves widening the nostrils and shortening the soft palate.

Maintain healthy weight — Extra weight worsens breathing difficulty. Follow our dog weight management guide to keep your brachycephalic dog lean.

Avoid heat and overexertion — Exercise during cool parts of the day, keep sessions short, and always have water available. Never leave a brachycephalic dog in a warm car, even briefly.

Clean skin folds daily — Use a damp cloth or veterinary wipe to clean between facial wrinkles and dry thoroughly. Moisture trapped in folds is a breeding ground for yeast and bacteria.

Monitor breathing continuously — If your dog’s breathing sounds get louder, if they show increased effort to breathe, or if they collapse after mild activity, seek veterinary attention immediately.

Before You Buy

If you are considering purchasing a brachycephalic puppy, think carefully. Seek breeders who prioritize health over extreme appearance — dogs with longer muzzles, open nostrils, and health-tested parents. Ask to see BOAS grading results for both parents. Better yet, consider adopting through breed-specific rescue organizations, where adult dogs’ health status is already known. Our guide on finding a reputable breeder covers what to look for in detail.

The dogs themselves did not choose to be bred this way. The least we can do is understand the consequences and make informed decisions.

Sources

1. Crufts health entry requirements for brachycephalic breeds — The Kennel Club — accessed March 26, 2026
2. BVA policy on brachycephalic dogs — accessed March 26, 2026
3. Brachycephalic breed popularity data — Pets4Homes — accessed March 26, 2026