If you have ever seen your cat panting with their mouth open and tongue out, it can be alarming. Unlike dogs, who pant to regulate their body temperature after a walk, cats are not built that way. A panting cat is usually a sign that something is off, whether it is a little stress or a serious medical issue. Let us walk through the most common reasons so you can tell the difference between a cat who just had a wild play session and one who needs urgent care.
1. Overheating and Heatstroke
Cats have very few sweat glands (they are mostly on their paw pads), so they rely on other methods to cool down. If your cat gets too hot, they may start panting to release heat. This is most common on scorching summer days, in a stuffy room without airflow, or after intense exercise. If your cat is panting and also drooling, has bright red gums, or seems wobbly, they could be suffering from heatstroke, which is an emergency. Move them to a cool, quiet spot, offer cool (not ice-cold) water, and call your vet immediately. Never leave a cat in a hot car, even for a minute.
2. Stress, Anxiety, or Excitement
Some cats pant when they are overwhelmed. A car ride to the vet, a new pet in the house, or even a loud thunderstorm can trigger a stress response that makes them breathe rapidly with their mouth open. This is usually temporary, and the panting should stop once the stressor is removed. If your cat is prone to anxiety, creating a calm environment with hiding spots and familiar bedding can help. For cats with allergies that cause sneezing or discomfort, stress can sometimes worsen breathing issues; check our guide on why your allergic cat sneezes so much for related signs to watch for.
3. Respiratory Issues: Asthma, Infections, and Allergies
Just like people, cats can develop asthma, bronchitis, or upper respiratory infections that make it hard to breathe. If your cat is panting along with coughing, wheezing, or a nasal discharge, this is a red flag. Allergies can also play a big role here. Environmental allergens like pollen or dust mites, and even food allergies, can cause inflammation in the airways. If your cat has been sneezing or scratching a lot, you might want to read about the signs of food allergies in cats to see if their diet could be a hidden trigger. Asthma attacks can be sudden and scary, so if your cat is struggling to breathe, get them to the vet right away.
If your cat pants after a short play session and then stops within a minute or two, they might just be out of shape. But if panting lasts longer than a few minutes or happens when they are resting, it is time for a checkup.
4. Heart Disease and Fluid in the Lungs
One of the more serious causes of panting in cats is heart disease, especially hypertrophic cardiomyopathy (HCM). When the heart is not pumping blood efficiently, fluid can build up in the lungs (pulmonary edema) or around the lungs (pleural effusion). This makes it very hard for a cat to breathe, and panting is often one of the first signs. You might also notice your cat breathing with their belly heaving, hiding more, or being less active. Heart disease is especially common in breeds like Maine Coons, Ragdolls, and Persians, but any cat can be affected. If you suspect heart trouble, do not wait, see your vet for an exam and possibly an echocardiogram.
5. Pain, Anemia, or Other Internal Issues
Sometimes panting is a response to pain or a lack of oxygen in the blood. Cats in pain from an injury, dental disease, or even a urinary blockage may pant as a stress response. Anemia (low red blood cell count) can also cause panting because the body is starved for oxygen. If your cat has pale gums, is lethargic, or has stopped eating, these are urgent signs. For cats who have frequent hairballs or vomiting issues, it is important to rule out that a hairball is not causing a breathing obstruction; you can learn more about whether hairballs can cause vomiting in cats to separate a normal hairball event from something more serious.
“A panting cat is not a happy cat. When in doubt, a trip to the vet is always the safest bet.”
When to Go to the Vet Immediately
Some panting is a true emergency. If your cat is panting and also has blue or purple gums, is collapsing, has a rapid heart rate, is unable to stand, or is making choking sounds, do not wait. Call your vet or an emergency animal hospital right away. For non-emergency panting that happens occasionally, keep a video of the episode to show your vet, as cats often stop panting the moment they walk into the clinic. And if your cat has known allergies, managing those can sometimes help with breathing; check out the life expectancy of a cat with allergies to understand long-term care. Remember, you know your cat best, trust your gut.
