Why Is My Dog Snoring So Loud at Night?

Common Cause: Brachycephalic Syndrome

Dogs with short muzzles—such as Bulldogs, Pugs, Pekingese, Shih Tzus, and Boston Terriers—often snore loudly due to a condition called brachycephalic syndrome. This syndrome involves physical deformities in the upper airway, including collapsed nostrils, an elongated soft palate, and eversion of the laryngeal saccules. These abnormalities restrict airflow, making breathing noisy, especially during sleep. The issue tends to worsen with age and can become more pronounced during exercise or when the dog is overheated.

When Snoring Signals a Health Problem

While occasional snoring is normal in certain breeds, sudden or worsening noisy breathing—especially if your dog usually breathes quietly—should be a red flag. Noisy breathing, including snoring, indicates an obstruction in the nasal passages, throat, or larynx. If snoring appears out of the blue or is accompanied by other symptoms like coughing, difficulty breathing, or changes in behavior, it may point to a serious issue such as laryngeal paralysis, a foreign body, or even heart or lung disease. In such cases, a vet visit is essential.

Other Factors That Can Increase Snoring

Obesity can contribute to louder snoring by adding pressure to the airway. Additionally, dogs have more sleep–wake cycles than humans—on average, 23 cycles per eight-hour night—meaning they shift between sleep and wakefulness frequently. During these transitions, breathing patterns can change, potentially increasing snoring. Dogs that sleep in certain positions, especially on their backs, may also experience more airway restriction and louder snoring.

When to See a Veterinarian

If your dog suddenly starts snoring loudly, especially if it’s not a breed prone to snoring, or if the snoring is accompanied by labored breathing, coughing, or changes in energy levels, it’s time to consult a veterinarian. Rapid, labored breathing at rest can indicate serious conditions like heart failure, lung disease, shock, or poisoning. A vet can assess the airway, check for structural issues, and recommend treatment such as surgery for stenotic nares or soft palate correction.

Breathing Patterns and Sleep Behavior

Dogs respond to sounds during both active and passive sleep, unlike humans who react more during REM sleep. This means dogs may stir or bark in response to noises even while sleeping. However, this doesn’t directly cause snoring. Instead, it highlights that dogs are alert during sleep cycles, which may affect their breathing patterns. Frequent sleep–wake cycles (averaging 23 per night) mean dogs spend less time in deep sleep, potentially leading to more irregular breathing and snoring during lighter sleep phases.