Panting is how dogs cool themselves down, so some panting is completely normal. But if your dog pants constantly, even while resting indoors at a comfortable temperature, something else may be going on. A healthy dog at rest breathes about 15 to 34 times per minute. Persistent panting that pushes well above that range, or panting that happens in calm, cool situations, can point to pain, illness, anxiety, or a medication side effect.
How Normal Panting Works
Dogs don’t sweat through their skin the way humans do. Instead, they rely on panting as their primary cooling system. When a dog pants, air moves rapidly across the moist surfaces of the tongue, mouth, and lungs, causing water to evaporate. That evaporation pulls heat away from the body.
As the need for cooling increases, the airflow pattern actually shifts. In mild heat, dogs inhale and exhale entirely through the nose. As they get warmer, they start exhaling through both the nose and mouth. At peak demand, they inhale and exhale through both the nose and mouth simultaneously. This progression is the body dialing up its cooling effort. After exercise or on a hot day, this kind of heavy panting is expected and should taper off within minutes once your dog rests in a cool spot.
Heat and Heatstroke
The most straightforward reason for heavy panting is that your dog is too hot. Dogs overheat faster than people realize, especially in humid weather when evaporative cooling becomes less efficient. A dog’s internal temperature of 104°F signals moderate heatstroke and requires immediate care. At 106°F, the situation becomes a dire emergency. Signs to watch for include frantic panting that doesn’t slow down, drooling, bright red gums, vomiting, stumbling, or collapse. If you suspect heatstroke, move your dog to a cool area, offer water, and apply cool (not ice-cold) water to their body while getting to a vet.
Pain
Dogs are notoriously good at hiding pain, but panting is one of the ways it leaks through. Pain-related panting tends to happen at rest and without an obvious trigger like heat or exercise. You might notice it alongside other subtle shifts: reluctance to jump or climb stairs, a change in posture, restlessness, loss of appetite, or flinching when touched in a specific area. Arthritis, injuries, abdominal pain, and dental problems can all cause this kind of panting. If your dog pants heavily while lying down in a cool room, especially at night, pain is one of the first things worth investigating.
Anxiety and Stress
Emotional distress triggers many of the same physical responses in dogs as it does in people. An anxious dog’s heart rate and breathing rate climb. Panting from stress often comes with other body language cues: pinned-back ears, a tucked tail, yawning, lip licking, pacing, or hiding. Common triggers include thunderstorms, fireworks, separation from their owner, car rides, or changes in the household. Some dogs develop chronic anxiety that causes low-grade panting throughout the day. If the panting follows a predictable pattern tied to specific events, stress is a likely explanation.
Heart Disease
When the heart can’t pump blood efficiently, fluid can back up into the lungs. This makes breathing harder, and your dog may pant or stand with their mouth open in an effort to get enough air. Key signs of heart disease include a persistent cough lasting more than a week or two, reluctance to exercise or slow recovery after activity, a swollen belly from fluid accumulation, and visible distress when lying down. A dog with heart-related breathing trouble may resist settling into a resting position because lying flat makes the fluid pressure in the lungs worse. These signs tend to develop gradually, so a dog that’s been slowly panting more over weeks or months deserves a cardiac workup.
Laryngeal Paralysis
The larynx is the structure at the top of the windpipe that opens to let air in and closes to keep food and water out. In laryngeal paralysis, the larynx stops opening properly, which is a bit like trying to breathe through a narrow straw. This condition is most common in older, larger breeds like Labrador Retrievers and Golden Retrievers.
The hallmark sign is noisy, raspy breathing alongside excess panting. You might also notice a change in your dog’s bark, gagging, coughing, or a dramatic intolerance for heat and exercise. Laryngeal paralysis can become an emergency if the dog gets excited, stressed, or exposed to hot, humid weather, because the increased breathing demand overwhelms the narrowed airway. Blue-tinged gums or tongue, or collapse, means the dog isn’t getting enough oxygen and needs emergency care.
Brachycephalic Breeds
Short-nosed breeds like Bulldogs, Pugs, French Bulldogs, Boston Terriers, and Shih Tzus are structurally prone to breathing problems. Their compressed skull shape leads to narrowed nostrils, an elongated soft palate that partially blocks airflow, and sometimes a windpipe that’s too narrow for their body size. Tissue near the vocal cords can get pulled inward during inhalation, creating yet another obstruction.
The result is a dog that works harder to breathe even under normal circumstances, and the problem tends to worsen over time. The extra effort causes throat tissues to become swollen and inflamed, narrowing the airway further. If you have a flat-faced breed and their panting, snoring, or noisy breathing has gotten louder or more frequent, it may be time to have the severity assessed. Surgical options exist to open up the airway in more severe cases.
Cushing’s Disease
Cushing’s disease happens when the body overproduces cortisol, a stress hormone. It’s relatively common in middle-aged and older dogs. Panting is one of the hallmark signs, along with increased thirst and urination, a ravenous appetite, a pot-bellied appearance, muscle wasting, hair loss, and thin skin. These symptoms develop gradually, so owners often chalk them up to normal aging. If your dog is panting more and you’ve also noticed them drinking and urinating significantly more than usual, Cushing’s disease is worth bringing up with your vet.
Anemia
Red blood cells carry oxygen throughout the body. When a dog doesn’t have enough of them, their organs and tissues are starved of oxygen, and the body compensates by breathing faster. Signs of anemia include panting, pale gums (check by pressing on the gum and seeing how quickly the pink color returns), weakness, and lethargy. Anemia itself isn’t a disease but a result of something else, whether that’s blood loss, destruction of red blood cells, or inadequate production. Pale gums combined with unexplained panting is a combination that warrants a prompt vet visit.
Medications
If your dog recently started a new medication and the panting followed, there may be a direct connection. Corticosteroids like prednisone, prednisolone, and dexamethasone are well-known for causing panting as a side effect. Other common side effects of steroids include increased thirst, increased hunger, and more frequent urination. The panting typically starts soon after beginning the medication and is dose-dependent, meaning higher doses cause more noticeable effects. Don’t stop a prescribed steroid abruptly, as that carries its own risks, but let your vet know the panting is happening so the dosage or medication can be adjusted if needed.
How to Monitor at Home
A simple way to track whether your dog’s breathing is truly abnormal is to count their resting respiratory rate. Wait until your dog is calm or asleep. Watch their chest rise and fall, and count the number of breaths in 30 seconds, then multiply by two. A breath is one full rise-and-fall cycle. A consistent resting rate above 30 breaths per minute is considered abnormal and worth reporting to your vet.
Do this over several days to establish a pattern. Write down the number, the time, and what your dog was doing. This simple log gives your vet much more useful information than “my dog pants a lot.” It also helps you spot a trend early, before the panting becomes dramatically worse. If the rate is consistently elevated at rest, in a cool environment, and without any recent exercise, something beyond normal thermoregulation is likely driving it.