Home / Dog questions / Why does my dog pant so much?
The short answer: most of the time, nothing is wrong. Panting is how a dog cools down, because dogs sweat very little. Panting after exercise, in warm weather or when excited is normal, and it should fade within a few minutes once your dog rests somewhere cool. The panting that needs a vet is different: panting at rest in a cool room, panting at night, panting that will not settle, or panting that comes with other signs such as coughing, weakness, vomiting or a change in gum colour.
Dogs cannot sweat the way people do: they have few sweat glands, mostly in the paw pads. Panting does the cooling instead. Air moves quickly over the wet tongue and airways, moisture evaporates, and that evaporation carries heat out of the body, while blood vessels near the skin expand so blood cools near the surface before travelling back through the body.
That is why panting follows heat, exercise and excitement so reliably: all three raise body temperature, and panting is the cooling system switching on. A normal dog temperature is 99.5 to 102.5 degrees Fahrenheit.
Panting is also a stress response. A dog at the vet, a dog listening to thunder, a dog in a car it dislikes may all pant hard in a cool room.
Most panting is easy to read once you know the pattern. Normal panting has a clear reason, starts when the reason starts, and fades steadily as the dog rests in a cool place. The dog stays bright and comfortable, and the breathing slows within five to ten minutes.
Panting to worry about breaks the pattern. It happens at rest in a cool room, at night, or it wakes the dog. It does not settle, or it keeps coming back. It is unusually loud, harsh or effortful, or it arrives with other signs: coughing, weakness, vomiting, diarrhea, restlessness, or gums that have changed colour.
The test that matters most is simple: does the panting fade when the reason for it goes away? A dog still panting hard half an hour later in a cool room needs a vet.
Heat is the most common reason a dog pants a lot, and exercise in warm weather is the most common way it happens. A dog that has been running or playing in the sun will pant hard. The risk is when the cooling cannot keep up: if it is too hot or too humid, a dog cannot pant enough to bring its temperature down, and overheating turns into heatstroke, which is an emergency.
The numbers help here. A body temperature above 103 degrees Fahrenheit is abnormal, and temperatures above 106 are most commonly heat stroke. Around 107 to 109 degrees, multiple organ failure and death become likely. So the simple rules matter: shade and cool water, short walks in peak heat, and never a dog alone in a parked car.
Some dogs overheat sooner than others. Flat-faced breeds such as pugs, bulldogs and boxers have narrowed airways, so the panting itself works less well, and overweight, older, thick-coated and heart or breathing troubled dogs are all at higher risk.
A dog does not need to be hot to pant. Excitement sets it off just as reliably: the doorbell, a visitor, a favourite walk, a game of fetch. Stress does the same. The vet quoted by the American Kennel Club notes that many dogs start panting the moment they walk into the examination room, and anxious dogs pant excessively at loud noises such as thunder or fireworks.
Stress panting usually comes with other body language: yawning, lip licking, ears pinned back, a tucked tail, or pacing. The panting fades when the stressful thing ends, which is the clue that stress was the cause.
Pain is one of the most under-recognised reasons a dog pants a lot, and it is often the reason for panting at rest or at night. Dogs hide pain well, and panting is one of the few signs that leaks out. The vet quoted by the American Kennel Club puts it plainly: dogs who have arthritis often come in panting. Back pain and abdominal discomfort often show up the same way, as panting with anxiety the dog cannot explain.
The other signs of pain help confirm it: vocalising, trembling, limping, restlessness, rapid breathing, and licking or biting at one spot. A dog in pain may keep changing position. If your dog has started panting at rest and is also moving differently, eating less or sleeping worse, pain belongs at the top of the list, and it belongs in front of a vet.
When the heart or the lungs cannot deliver enough oxygen, a dog pants to make up the difference. Dogs with asthma, bronchitis or laryngeal paralysis often pant because they are not getting enough airflow. Panting can also be a sign of congestive heart failure, which develops when fluid gathers in the lungs and leads to excessive panting or rapid breathing when the dog is at rest.
Heavy panting and coughing can also occur with lung tumours, choking or swallowing difficulties. Watch for panting that comes with effort: the belly moving hard with every breath, wheezing, a cough that will not clear, or a head and neck held outstretched to breathe. A dog panting like this needs a vet promptly, and a dog struggling for air needs one now.
In middle-aged and senior dogs, panting at rest can be a sign of Cushing's disease: an overproduction of cortisol, a stress hormone, usually because a small tumour drives the adrenal glands to make too much of it. One of the first signs owners often notice is a pot-bellied appearance, from fat gathering and weakening abdominal muscles.
The diaphragm is made of muscle too, and when it weakens, a dog with Cushing's may pant while doing nothing at all. The other signs build the picture: drinking and urinating more, eating more, gaining weight without eating more, hair loss and thin skin. Cushing's is a slow, progressive disease, not an emergency like heatstroke, but it still needs a vet, a diagnosis and a plan.
Some medicines raise panting as a side effect. Steroids such as prednisone and prednisolone are the usual suspects, and opioids can do it too. If your dog started panting heavily within days of a new medicine, tell the vet who prescribed it. Never stop a prescribed medicine on your own.
Weight makes everything harder. An overweight dog works harder to move, cool down and breathe, so it pants more at lower levels of effort, and the extra weight strains the heart and lungs. Senior dogs pant more too. If your dog is heavy, old or flat-faced, treat heat as a bigger risk than it looks.
Some poisons raise body temperature, and panting is the visible result. Rat bait is the example the American Kennel Club names: a dog that gets into it can develop hyperthermia, and along with the panting you may see drooling, vomiting, lethargy or an unwillingness to exercise.
If you think your dog has eaten something poisonous, tell the vet exactly what it was, with a photo of the product if you can. If the dog is panting heavily and you know it got into something it should not have, do not wait for more symptoms: call your vet or an emergency clinic now, and if it is after hours, call the ASPCA Animal Poison Control Center at (888) 426-4435.
Night panting deserves its own look, because it is the pattern owners notice most and understand least. Start with the room: a warm bedroom is the simplest cause, and a cooler sleeping spot or a fan may end it. If the room is cool and the panting keeps coming back, the usual causes are pain, anxiety, Cushing's disease, heart disease or a medicine taken in the evening.
Arthritis is the most common of these, because a sore joint hurts more when a dog lies still. Anxiety can do it too: a dog frightened by night noises, or that paces and pants after the house goes quiet, may be telling you about fear rather than heat. Panting at night that keeps happening, or that wakes the dog, is a vet visit, and our guide on why dogs pant at night covers that pattern in detail.
Heatstroke is the panting emergency, and it can kill a dog. The signs build fast: heavy panting that will not stop, fast breathing, dry or sticky gums, gums turned dark red or blue, thick drooling, vomiting or diarrhea, weakness, confusion, wobbliness, tremors, collapse or seizures.
What you do in the first minutes matters. The Royal Veterinary College recommends cooling first and transporting second. Move the dog into shade or a cool room, pour cool water, not cold, over the head, stomach, armpits and feet, and fan the dog to help the water evaporate. Offer small sips of water if the dog can drink, and call your vet.
Do not use ice baths, ice packs or rubbing alcohol: very cold water can push a dog toward shock. Do not cover the dog with wet cloths, which trap heat instead of letting it escape. And do not skip the vet because the dog looks better: kidney, gut and blood damage can show up days later.
A normal resting breathing rate is 20 to 35 breaths per minute. When vets see dogs entering the 40 to 60 breaths per minute range, that is very concerning: the dog is not moving oxygen properly around the body, and that needs immediate veterinary attention.
Count it while your dog is resting or asleep, never just after exercise. Watch the chest rise and fall for 30 seconds and double the number, or count for 15 seconds and multiply by four. Do it a few times on ordinary days so you know your dog's normal number, and write it down. A rate of 40 or more at rest is a reason to go now rather than tomorrow.
Work through this in order, and let the answers decide what happens next.
Most panting settles with rest and cooling. These signs mean it will not, and they mean now, not tomorrow.
If you are unsure which band your dog sits in, call your vet and describe what you see.
More everyday questions: why dogs shake, why dogs sleep so much, do dogs dream, why dogs follow you everywhere and all our dog questions. Breathing and sleep help: excessive panting triage and reading dog body language.
Yes, in the right context. Panting after exercise, in warm weather or when excited is normal, and it should fade steadily once your dog rests somewhere cool. Panting that happens at rest in a cool room, at night, for no clear reason, or that will not settle is not normal panting, and it is worth a vet visit. The test that matters most is simple: does the panting fade when the reason for it goes away? If it does, your dog was cooling down. If it does not, something else is driving it.
Start with the room: a warm bedroom is the simplest cause, and a cooler sleeping spot may end it. If the room is cool, night panting often points to pain, and arthritis is the usual suspect, because sore joints hurt more when a dog lies still. Anxiety, Cushing's disease, heart disease and some medicines can also keep a dog panting through the night. One restless night after a hot day is rarely a worry. Panting at night that keeps coming back is a vet visit, and our guide on why dogs pant at night covers that pattern in detail.
Because heat is only one reason dogs pant. Excitement, stress and fear can all set it off, as can pain, medication side effects, illness, heart disease, breathing problems or Cushing's disease. Look at the whole picture: what was happening just before the panting started, whether the dog can settle, and whether anything else has changed, such as drinking more, eating less, coughing or slowing down on walks. Panting with no heat trigger and no clear reason to be excited or stressed is the kind to take to the vet.
If heat or exertion is the cause, move your dog to a cool, shaded area, offer fresh water, and let the dog rest. If excitement or stress is the cause, make the surroundings calm and give the dog time to relax on its own. Do not force the dog to lie down, and do not cool the dog with ice baths or ice packs. If the panting is severe, will not settle after a few minutes of rest, or has no clear cause, contact your veterinarian rather than trying more home measures.
A normal resting breathing rate is 20 to 35 breaths per minute. Count while your dog is resting or asleep, never just after exercise: watch the chest rise and fall for 30 seconds and double the number, or count for 15 seconds and multiply by four. A resting rate of 40 to 60 breaths per minute is very concerning and needs immediate veterinary attention. A rate that stays high after five to ten minutes of rest is also a reason to get to a vet within 30 minutes.
Call an emergency vet now if heavy panting comes with vomiting or diarrhea, dark red or blue gums, weakness or an inability to walk, collapse, muscle tremors, seizures, or a temperature above 104.5 degrees Fahrenheit. Panting that will not stop after cooling and rest, panting with gasping or an inability to stand or drink, and a resting breathing rate of 40 or more per minute are emergencies too. When in doubt, call the clinic and describe what you see: vets would rather hear about a false alarm than about a dog that arrived too late.
This page is general information drawn from the published guidance of the organizations listed under Sources below. It is not veterinary advice, and it does not replace your own veterinarian, who can see your dog in person. If your dog is panting heavily and you are worried, or if any of the red flags below are present, contact your veterinarian or an emergency clinic now rather than waiting to see whether it passes. Never give a dog human painkillers: several common ones are toxic to dogs.
Last updated: November 2026. How we work: our methodology.