If you've never heard of brachycephalic dogs, you might think that this term refers to some type of canine disorder that you would want to avoid. But the truth is that this term applies to some of the most popular and beloved dog breeds. Here's all you need to know about these adorable short-nosed dogs.

What Are Brachycephalic Dogs?

Brachycephalic literally means "short-headed," explains the American College of Veterinary Surgeons. This term refers to dogs and dog breeds with shortened snouts. Popular brachycephalic breeds include English and French bulldogs, bull mastiffs, Boston terriers, boxers, pugs, shih tzus, Lhasa apsos and Pekingese, among others. The term can also be applied to mixed breed dogs that inherited this trait from brachycephalic ancestors. Brachycephalic dogs tend to have extremely shortened snouts that make them almost appear flat-faced, which differentiates them from some breeds that simply have shorter snouts.

Are There Special Health Concerns for Brachycephalic Dogs?

While not all of these dogs have associated health problems, the shape of the nose and head of a brachycephalic dog can place them at risk for a condition called brachycephalic airway syndrome, says Dr. Cheryl Yuill for Veterinary Centers of America. VCA Hospitals. There are four distinct upper airway abnormalities that can cause this condition, and a brachycephalic dog can have one or more of these abnormalities.

They include:

• Stenotic nares: Small or narrow nostrils, which can restrict the airflow into the nostrils when the dog breathes through his nose.
• Elongated soft palate: The soft palate — the soft tissue on the roof of the mouth — is too long and extends into the back of the throat, which causes blockage to the trachea.
• Hypoplastic trachea: The windpipe, or trachea, is narrower in diameter than what is normal.
• Everted laryngeal saccules: Laryngeal saccules are small sacs located just inside the dog's larynx. These can become everted, or turned outwards, when a dog struggles to breathe through narrowed nostrils or an elongated soft palate. Although this abnormality is typically caused by one of the above abnormalities, it can lead to additional obstruction of a dog's airway.

Dogs that suffer from this syndrome typically have a history of loud snoring and noisy breathing. They may also have a sensitive gag reflex, or be prone to reverse sneezing or tracheal collapse. The gums or tongue can sometimes turn blue from lack of oxygen, and overexertion or over-excitement can lead to collapse. Because of their breathing difficulties, these dogs tend to have a low tolerance for vigorous exercise and are highly susceptible to heat exhaustion and heat stroke.

Because these conditions and their symptoms are exacerbated by obesity, the first line of treatment for an overweight dog with this condition is usually to be put on a weight-loss meal plan. Mild cases can usually be managed by controlling the dog's weight, monitoring exercise levels, keeping the dog out of heat and humidity, and reducing or avoiding stress. For short-term treatment of flare-ups that cause respiratory distress, veterinarians might prescribe corticosteroids to reduce inflammation and/or treat the dog with oxygen. More severe cases may require surgery to improve airflow.