A softly snoring dog on the couch is familiar in many homes. The noise comes from turbulent airflow. For some dogs it is only sleep-position noise. For short-muzzled breeds it can be part of a wider airway problem called brachycephalic obstructive airway syndrome (BOAS).
Why dogs snore
VCA explains that snoring comes from vibrations in the upper airways. Loudness depends on narrowing or blockage. Some snoring is expected: an unusual sleep posture (for example, a dog who usually curls up but flops on their back) can make a quiet sleeper snore for that nap.
Snoring is more common in flat-faced, short-snouted dogs such as pugs and bulldogs because of upper-airway conformation — narrowed nostrils or an elongated soft palate. Some of those dogs do well; others have real respiratory difficulty (brachycephalic airway syndrome / BOAS).
Common reasons
BOAS anatomy: Cornell’s Riney Canine Health Center describes brachycephalic dogs as having a shortened muzzle and flattened face. Common airway issues include stenotic (small) nares, an elongated soft palate, everted laryngeal saccules, and sometimes a hypoplastic (too-narrow) trachea. VCA lists the same cluster, plus possible laryngeal collapse over time from the extra work of breathing.
Breeds Cornell names most often: English bulldog, pug, French bulldog, and Boston terrier; also boxer, Pekingese, shih tzu, Chinese shar-pei, Lhasa apso, and bullmastiff. VCA’s BOAS page includes a similar list.
Other contributors VCA notes for snoring in pets generally: allergies or infection (swelling and discharge), a foreign object in the nose, extra body fat padding the airways, and — especially in older animals — masses that obstruct airflow.
Mild BOAS signs VCA describes: noisy breathing, especially with exercise; snorting when excited; snoring when relaxed or asleep. Heat, humidity, and exertion make signs worse because panting is how dogs cool themselves, and that system is already compromised.
Normal vs concerning behavior
What owners can do
Cornell’s conservative care for milder BOAS: keep a healthy weight, avoid excessive heat and humidity, control activity, reduce stress, and use a harness instead of a neck collar so the throat is not compressed. VCA likewise flags obesity as a major contributor to snoring and recommends a vet-guided weight plan when extra weight is involved.
Keep sleep areas cool and well ventilated. Do not use leftover human breathing medicines. If your dog is in a respiratory crisis, Cornell says to go to a veterinarian or emergency hospital immediately.
When to call a vet or trainer
Contact your veterinarian if snoring is new, very loud, or paired with noisy breathing while awake, poor exercise tolerance, gagging, or obvious struggle to move air. Flat-faced breeds may need a BOAS assessment. Cornell notes many dogs are diagnosed between one and four years of age; earlier evaluation is better if breathing already looks hard.
A trainer is not the primary resource for snoring. After medical issues are addressed, a trainer can help with calm rest routines if anxiety disrupts sleep.