Most of the time, a dog breathing fast while sleeping is simply dreaming. During the deepest phase of sleep, dogs experience bursts of brain activity that temporarily speed up their breathing, cause twitching, and may even produce small whimpers. A healthy adult dog breathes an average of about 13 breaths per minute while sleeping, and rates under 30 breaths per minute are considered normal. If your dog’s breathing settles back down within a few minutes, there’s usually nothing to worry about.
What Happens During REM Sleep
Dogs cycle through the same sleep stages humans do, including REM (rapid eye movement) sleep, where most dreaming occurs. During REM, muscle tone throughout the body drops significantly, but the brain becomes highly active. This creates the twitching paws, flickering eyelids, and irregular breathing you’re probably noticing. Your dog’s breathing may become fast and shallow for 30 seconds to a few minutes, then slow back to its normal rhythm as the REM phase ends.
Puppies and younger dogs spend more time in REM sleep than older dogs, which is why you’ll notice fast breathing episodes more frequently in them. This is completely normal and part of healthy brain development. If the rapid breathing stops on its own and your dog seems relaxed when they wake up, REM sleep is almost certainly the explanation.
How to Count Your Dog’s Breathing Rate
To know whether your dog’s breathing is actually too fast, you need a baseline. Watch your dog’s chest or belly rise and fall while they’re in a calm, non-REM phase of sleep (no twitching, no eye movement). Count the number of rises in 30 seconds and multiply by two. That gives you breaths per minute.
In a large study of healthy adult dogs, the average sleeping respiratory rate was 13 breaths per minute, and no dog averaged above 23. Occasional spikes above 30 happened in a few dogs but were brief and tied to REM episodes. The key number to remember: a sustained sleeping rate consistently above 30 breaths per minute, outside of obvious dreaming, is worth investigating.
Heat and Environment
Dogs regulate body temperature primarily through panting rather than sweating. Research on airflow patterns in dogs shows that resting dogs begin to shift into faster, more open-mouthed breathing when ambient temperatures climb above about 26°C (79°F). Above 30°C (86°F), panting becomes the dominant pattern even at rest. If your home is warm, your dog may breathe faster during sleep simply to cool down. Moving their bed to a cooler spot, turning on a fan, or lowering the thermostat can resolve this quickly.
Overweight dogs and breeds with thick double coats are more sensitive to heat, so they’ll start panting at lower temperatures than lean, short-coated dogs.
Flat-Faced Breeds Have Extra Challenges
If you have a Bulldog, Pug, French Bulldog, Boston Terrier, or another short-nosed breed, faster or noisier breathing during sleep is more common. These dogs have compressed airways, oversized tongues, and soft tissue that can partially block airflow, a condition known as brachycephalic obstructive airway syndrome (BOAS). Research published in the Journal of Veterinary Internal Medicine found that brachycephalic dogs had 5.6 times the risk of sleep-disordered breathing events compared to dogs with longer muzzles, and dogs with moderate to severe BOAS had 2.5 times the risk on top of that.
These breathing disruptions are most common during REM sleep, when the muscles supporting the upper airway relax further and the already narrowed passages become even more prone to collapse. You may notice your flat-faced dog snoring loudly, gasping, or even sleeping with their head propped up or a toy in their mouth. That positioning is their way of keeping the airway more open. If your brachycephalic dog regularly snorts awake, gasps for air, or seems restless during sleep, a veterinary evaluation can determine whether surgical correction would help.
When Fast Breathing Signals a Health Problem
Several medical conditions can raise your dog’s resting and sleeping respiratory rate. The most serious is congestive heart failure, where fluid accumulates in or around the lungs. In dogs with well-controlled heart failure on medication, the median sleeping respiratory rate is about 20 breaths per minute, and most stay below 30. When heart failure becomes unstable, fluid buildup makes it harder for the lungs to exchange oxygen, and the body compensates by breathing faster. Veterinary cardiologists often ask owners to track sleeping respiratory rates at home precisely because a rising trend is one of the earliest signs that medication needs adjusting or that the condition is worsening.
Other conditions that can increase breathing rate during sleep include pneumonia or other lung infections, anemia (where fewer red blood cells mean less oxygen per breath, so the body breathes more to compensate), and pain from injuries, arthritis, or post-surgical recovery. Pain activates the body’s stress response, which raises heart rate and breathing rate even during rest. A dog in pain may also be restless, reluctant to lie in certain positions, or slower to get up.
Signs That Need Veterinary Attention
Cornell University’s veterinary school identifies several specific warning signs of respiratory distress that go beyond a temporarily elevated breathing rate:
- Sustained rate above 30 breaths per minute during quiet sleep, outside of REM episodes, especially if this is new for your dog
- Abdominal effort while breathing, where the belly visibly contracts with each breath rather than the chest expanding gently
- Blue or purple tinge to the gums or muzzle, which indicates the blood isn’t carrying enough oxygen
- Open-mouthed breathing at rest in a cool environment, particularly in a dog that doesn’t normally do this
- Coughing, wheezing, or gagging that accompanies the fast breathing
A single REM episode with fast breathing and twitchy paws is normal. Fast breathing that persists after your dog wakes, returns every night with increasing intensity, or comes with any of the signs above is a different situation. The sleeping respiratory rate is one of the most useful numbers you can track at home, because a gradual climb from your dog’s baseline often shows up before other symptoms do.