Brachycephalic Breeds / Syndrome
Dogs With Special Faces
Most people are not familiar with the term “Brachycephalic,” but if you own a Pug, Boston Terrier, Pekingese, Boxer, Bulldog, Shih tzu or any one of the other breeds with “pushed in” faces, you should become familiar with this word. The word comes from Greek roots “Brachy,” meaning short and “cephalic,” meaning head.
Brachycephalic dogs have been bred so as to possess a normal lower jaw, that is, one in proportion to their body size, and a compressed upper jaw. In producing this cosmetic appearance, we have compromised these animals in many important ways and you, as an owner, must be familiar with the special needs of your pet.
The Respiratory System
Brachycephalic breeds are characterized by “brachycephalic respiratory syndrome,” which affects the different areas of the respiratory tract. Fortunately, most dogs do not suffer from all aspects of the syndrome but you should be aware of which your particular pet may have.
STENOTIC NARES – This is a fancy name for narrowed nostrils. The brachycephalic dogs begins by having very small nasal openings for breathing. If this is severe, surgical correction is possible.
ELONGATED SOFT PALATE - It is difficult to fit the soft tissues of the canine mouth and throat into the brachycephalic’s short face. As a result, the soft palate, which separates nasal passage from oral cavity, flaps loosely down into the throat creating snorting sounds. Virtually all brachycephalics suffer from this, so keep in mind, complications from respiratory distress can happen with little warning and can result in death. The English Bulldog tends to have more severe symptoms in almost all aspects of brachycephalic syndrome. Excess barking or panting may lead to swelling in the throat which can, in turn, lead to trouble. Again, the soft palate can be surgically trimmed.
TRACHEAL STENOSIS – The brachycephalic dog’s windpipe may be dangerously narrowed in places. This condition creates tremendous anesthetic risk and should be ruled out by chest radiographs prior to any surgical procedures.
EVERTED LARYNGEAL SACCULES – The normal larynx has two small pockets called “ventricles” or “saccules.” When a dog has increased effort in breathing, over time these little pockets will actually turn inside out inside the throat. When this occurs, the protuberances need to be surgically snipped. In fact, this finding indicates that surgery for the stenotic nares and elongated soft palate is also warranted lest it progress to a full laryngeal collapse.
HEAT STRESS - Because of all these upper respiratory obstructions, the brachycephalic dog is an inefficient panter. A dog with a more conventional face and throat is able to pass air quickly over the tongue through panting. Saliva evaporates from the tongue as air is passed across and the blood circulating through the tongue is efficiently cooled and circulated back to the rest of the body. In the brachycephalic dog, so much extra work is required to move the same amount of air that the airways become inflamed and swollen. This leads to a more severe obstruction, distress, and further over-heating.
BRACHYCEPHALIC DOGS ARE THE MOST LIKELY CANDIDATES FOR HEAT STROKE.
Altogether, the upper airways of the brachycephalic dog compromises his or her ability to take in air. Under normal conditions the compromise is not great enough to cause a problem; however, an owner should take care not to let the dog become grossly overweight or get too hot in the summer months. Be aware of what degree of snorting and sputtering is usual for your individual pet plus, should your pet require general anesthesia or sedation, your vet may want to take extra precautions or take radiographs prior to assess the severity of the syndrome. Anesthetic risk is higher than usual in these breeds, though under most circumstances the necessary extra precautions are readily managed by most animal hospitals.
To be clear, brachycephalic syndrome can be progressive if it is not corrected at an early stage. Severely affected dogs can actually experience collapse of the larynx and require a permanent tracheostomy (a hole in the throat for breathing).