Understanding BOAS in Dogs: Breathing Issues Explained for Local Owners

Many dog owners in Blackheath, Greenwich, Lewisham, Kidbrooke and Woolwich are familiar with flat-faced breeds such as Bulldogs, French Bulldogs, Pugs, Boston Terriers and Shih Tzus. These dogs can be wonderful companions, but their shorter skull shape can sometimes lead to ongoing breathing difficulties. This condition is known as BOAS, or Brachycephalic Obstructive Airway Syndrome.

At Blackheath Vets, we know how worrying it can be to hear your dog snoring heavily, struggling in warm weather or becoming tired after only gentle exercise. The good news is that early recognition and the right veterinary support can make a real difference to your dog’s comfort and quality of life.

In this article, we explain what BOAS is, which signs to look out for, when to seek advice, and how our BOAS grading clinic can help.

What is BOAS?

BOAS stands for Brachycephalic Obstructive Airway Syndrome. In simple terms, it refers to breathing problems linked to the shape of a dog’s head, nose and throat. “Brachycephalic” means short-headed. Dogs with flatter faces often have narrowed airways, which can make breathing more difficult than it should be.

Although these dogs may look perfectly healthy from the outside, some are working much harder to breathe than owners realise. BOAS can range from mild to severe, and symptoms may become more noticeable with exercise, excitement, stress or hot weather.

Which dogs are most at risk?

BOAS is most commonly seen in flat-faced breeds, including:

• French Bulldogs
• Pugs
• English Bulldogs
• Boston Terriers
• Shih Tzus
• Boxers
• Cavalier King Charles Spaniels, in some cases

Not every flat-faced dog will have severe breathing problems, but many do have some degree of airway narrowing. Because signs can develop slowly, they are sometimes mistaken for “normal for the breed”. In reality, noisy or laboured breathing should never simply be ignored.

Common signs of BOAS in dogs

BOAS symptoms can vary. Some dogs show only mild signs, while others struggle with everyday activities.

Early signs owners may notice

• Loud breathing, snorting or snoring when awake
• Noisy sleep
• Tiring quickly on walks
• Struggling to cope with heat
• Reluctance to exercise
• Gagging or retching, especially after eating or drinking
• Excessive panting after mild activity

More serious symptoms

• Breathing with obvious effort
• Collapse or fainting episodes
• Bluish gums or tongue
• Severe distress in warm weather
• Difficulty recovering after exercise or excitement

If your dog is showing any of these signs, it is worth arranging a check-up. Our health checks and clinics can help assess your pet’s breathing and overall wellbeing.

Why BOAS matters

Dogs with BOAS are not simply “a bit noisy”. Breathing issues can affect their sleep, exercise tolerance, ability to keep cool and general quality of life. Because dogs regulate body temperature partly through panting, any narrowing of the airway can make hot weather especially risky.

Some affected dogs may also develop secondary problems over time, including irritation of the throat, digestive upset, disturbed sleep and increased stress on the body. That is why early assessment is so important.

What causes the breathing problem?

BOAS often involves several changes to the airway. These may include narrowed nostrils, an overly long soft palate at the back of the mouth, and changes within the throat that restrict airflow. You do not need to remember the medical terms to spot that something may be wrong. The key point is that the airway is narrower than normal, so your dog has to work harder to get enough air in and out.

Over time, that extra effort can worsen the problem. This is one reason we encourage owners to seek advice early rather than waiting until symptoms become severe.

When should you see a vet?

It is a good idea to book an appointment if your dog:

• Breathes noisily on a regular basis
• Seems unusually tired after exercise
• Struggles in warm weather
• Has episodes of gagging or retching
• Snores heavily when resting
• Has had any collapse, distress or worsening breathing

If your dog is in severe breathing distress, has collapsed, or is struggling urgently, please seek immediate help through our emergency 24-hour vetcare service.

How a BOAS assessment can help

At Blackheath Vets, we offer a dedicated BOAS grading clinic to assess dogs that may be affected. This type of assessment helps us understand how much your dog’s breathing is being affected and whether treatment or monitoring may be advised.

A BOAS check may include:

• Discussing the signs you have noticed at home
• Examining your dog’s nostrils, breathing and general condition
• Assessing breathing before and after light exercise where appropriate
• Advising on weight management, lifestyle adjustments and next steps

Some dogs benefit from careful monitoring and practical home changes, while others may need further investigation or surgery to improve airflow. If advanced treatment is needed, we can guide you through the options, including support from our advanced surgery and medicine services where appropriate.

Practical ways to help a dog with BOAS

While veterinary assessment is essential, there are also sensible steps owners can take at home to help reduce strain on the airway.

Keep your dog at a healthy weight

Excess weight can make breathing problems worse. Keeping your dog slim can significantly improve comfort and reduce pressure on the airway. Our preventative healthcare services can support you with weight and wellbeing advice.

Avoid overheating

Flat-faced dogs are often less able to cope with heat. In warmer weather:

• Walk early in the morning or later in the evening
• Keep exercise gentle
• Ensure constant access to shade and fresh water
• Never leave your dog in a car

Use a harness rather than a collar

A well-fitted harness can reduce pressure on the neck and throat compared with a collar, especially during walks.

Watch for changes over time

If your dog’s breathing becomes noisier, recovery after exercise takes longer, or warm weather becomes more difficult, it is worth arranging a review. Small changes can be easy to miss until they start affecting daily life.

Can BOAS be treated?

In many cases, yes. Treatment depends on how severely your dog is affected. Mild cases may be managed with weight control, lifestyle changes and regular monitoring. More significant cases may benefit from surgery to open the airway and make breathing easier.

The right approach will depend on your dog’s age, breed, symptoms and examination findings. We will always talk you through the options clearly and help you make an informed decision based on your pet’s needs.

Prevention and early awareness

BOAS cannot always be prevented in dogs that are already born with a flat-faced shape, but early awareness is very important. Recognising that snoring, noisy breathing and poor exercise tolerance may indicate a genuine health problem is the first step.

Routine check-ups can be especially helpful for at-risk breeds. If you have recently welcomed a new puppy, our free puppy and kitten health checks and Puppy VIP plan can help you get started with good preventative care from the beginning.

Support for local dog owners

We are proud to support pet owners across Blackheath, Greenwich, Lewisham, Kidbrooke and Woolwich with friendly, practical veterinary care. Whether you are concerned about noisy breathing in a young French Bulldog or worsening exercise tolerance in an older Pug, we are here to help.

If you are worried about your dog’s breathing, you can book an appointment online, register your pet with us, or learn more about why local owners choose Blackheath Vets.

Final thoughts

BOAS is a common but often misunderstood problem in flat-faced dogs. Noisy breathing, heavy snoring and struggling in the heat are not just quirks of the breed. They can be signs that your dog is finding it hard to breathe comfortably.

With early advice, sensible day-to-day management and veterinary support where needed, many dogs with BOAS can enjoy a better quality of life.

This article is intended for general guidance only. If your pet is unwell or showing concerning symptoms, please contact your vet for professional advice.

If you would like your dog assessed, please contact Blackheath Vets or visit our BOAS grading clinic page to find out more. We are here to support you and your pet with trusted local care.