A healthy dog at rest takes between 15 and 30 breaths per minute. During sleep, the rate often drops to the lower end of that range. If your dog consistently breathes faster than 35 breaths per minute while resting or sleeping, that’s a sign something may be off and worth investigating.
How to Count Your Dog’s Breathing Rate
The best time to check is when your dog is sleeping or lying down calmly. Watch the chest rise and fall. One complete breath equals one rise (inhale) and one fall (exhale) of the chest wall.
Use a phone timer set to 30 seconds and count each breath you see. Multiply that number by two to get breaths per minute. If you prefer, you can count for a full 60 seconds and skip the math. Texas A&M’s veterinary cardiology team recommends this method for home monitoring, and it works well once you’ve done it a couple of times.
Avoid counting while your dog is panting, playing, or just coming inside from a walk. Those situations raise the rate dramatically and won’t give you a useful baseline number.
What Affects a Dog’s Breathing Rate
Several everyday factors push the number up temporarily. Heat, excitement, stress, and physical activity all increase breathing. Dogs also pant to cool down, since they can’t sweat through most of their skin. This is normal and doesn’t count as an elevated resting rate.
Puppies tend to breathe slightly faster than adult dogs, and smaller breeds generally have a higher resting rate than larger ones. A small dog breathing 25 to 30 times per minute at rest is perfectly typical, while a large, relaxed dog might sit closer to 15 to 20.
Dreaming can also cause brief bursts of faster breathing during sleep. If the rate settles back down within a minute or two, there’s nothing to worry about.
Panting vs. Fast Breathing
These look different and mean different things. Panting is dramatic: mouth wide open, tongue hanging out, breathing rates that can hit 200 to 400 breaths per minute. Despite how intense it looks, each breath during panting is shallow, moving less air into the lungs per breath. This is your dog’s cooling system working as designed.
Abnormally fast breathing (what vets call tachypnea) is subtler and easier to miss. The rate sits in the 40 to 90 breaths per minute range, but the breaths are deeper than panting breaths. Your dog may breathe through the nose or mouth, and the tongue typically stays inside the mouth. This pattern, especially at rest, is more concerning than panting because it suggests the body is working harder to get enough oxygen.
A third category is labored breathing, where your dog visibly struggles to inhale or exhale. You might notice exaggerated belly movement, flared nostrils, or an anxious posture with elbows pushed out. This is an emergency.
Why a Dog’s Breathing Rate Might Be Too High
A consistently elevated resting rate can point to a range of problems. Heart disease is one of the most common causes, particularly in older dogs. When the heart can’t pump efficiently, fluid can build up in or around the lungs, forcing faster breathing to compensate.
Other causes include respiratory infections like pneumonia, airway problems such as tracheal collapse or laryngeal paralysis, and brachycephalic airway syndrome (common in flat-faced breeds like bulldogs, pugs, and French bulldogs). Asthma, bronchitis, and fluid accumulation around the lungs are also possibilities.
Some conditions mimic respiratory disease without directly involving the lungs. A low red blood cell count (anemia) means less oxygen carried per breath, so the body compensates with more breaths. Pain from an injury or illness can elevate the rate. So can anxiety, which is why the resting or sleeping measurement matters so much: it filters out the emotional noise.
The 35 Breaths Per Minute Threshold
Veterinary cardiologists at Tufts University use 35 breaths per minute as a key cutoff for dogs with heart disease. When heart failure is well controlled with medication, most dogs breathe below 35 breaths per minute at rest. A rate that climbs above 35 to 40 while resting, especially with visible belly wall movement during breathing, signals that fluid may be building up in the lungs again and medication needs adjusting.
Even if your dog hasn’t been diagnosed with heart disease, the 35 breaths per minute number is a useful red flag for any dog. A healthy resting rate rarely exceeds 30. If you’re consistently counting above 35 when your dog is calm and relaxed, that’s worth a veterinary visit regardless of whether your dog seems otherwise fine.
Tracking Breathing Rate Over Time
A single count is useful, but a pattern is more informative. Checking your dog’s resting breathing rate a few times per week and writing it down gives you a baseline. You’ll quickly learn what’s normal for your individual dog, and you’ll spot a trend upward before it becomes obvious.
This is especially valuable for dogs already diagnosed with heart conditions. Tufts’ cardiology team recommends that owners track breathing rate alongside appetite and medication schedules, because those three data points together help veterinarians fine-tune treatment between visits. But even for healthy dogs, knowing their normal number means you’ll catch something early rather than late.