A cat sitting with its mouth open, breathing fast, or panting after only mild activity is not behaving like a dog cooling off. Cats rarely pant. The important question is whether your cat can breathe comfortably right now—not which medication might stop the panting.
Open-mouth breathing can be an emergency
If your cat is breathing with its mouth open at rest, appears to be working hard to breathe, collapses, or has pale, gray, or blue gums, go to an emergency veterinarian immediately. Do not wait 15 or 20 minutes to see whether the symptom passes. Keep your cat calm, place them gently in a carrier, and call the clinic while you are traveling if another person can make the call.
Signs of increased breathing effort include flared nostrils, an extended neck, pronounced movement of the abdomen, or an inability to settle comfortably. A cat in respiratory distress should be handled as little as possible. Trying to examine the mouth, force food or water, or give medication can make things worse.
What might cause a cat to pant?
After intense play or an unusually stressful car ride, a cat might briefly breathe with an open mouth. However, stress is a diagnosis of exclusion when the breathing looks abnormal. Heat exposure, heart disease with fluid in or around the lungs, feline asthma, other lung conditions, pain, and anemia can also affect breathing. A cat with an upper respiratory infection may have nasal congestion, but that does not make persistent mouth breathing safe to ignore.
Watch the whole animal rather than trying to identify a disease from one sign. Is your cat hiding, refusing food, coughing, moving reluctantly, or breathing faster than usual while sleeping? Does the abdomen move noticeably with every breath? These details help the veterinarian choose an appropriate examination.
What to do if your cat is breathing normally now
If a short episode ended completely after vigorous play and your cat is now alert and breathing quietly, stop the activity, move to a comfortably cool space, and contact your veterinary clinic for individual advice. An episode that recurs, happens at rest, or comes with any other illness sign needs prompt in-person assessment.
While your cat is genuinely asleep or relaxed with its mouth closed, you can count chest rises for 30 seconds and double the number to estimate breaths per minute. Keep a record of the number, the circumstances, and any video you can capture without disturbing your cat. Do not delay urgent care to collect a video or a breathing count.
What the veterinary visit may involve
The team will first judge whether oxygen and stabilization are needed before performing detailed tests. Once the cat is stable, an examination, chest imaging, ultrasound, bloodwork, or other tests may be recommended depending on the suspected cause. Treatment is guided by the finding; home use of human inhalers, sedatives, or other medications is not an appropriate substitute.
Can a video vet visit help?
Telehealth may help discuss a fully resolved episode, review a video, or determine the next appropriate appointment. It cannot measure your cat’s oxygen level, listen to the lungs directly, or safely replace emergency care for labored breathing. An online visit should never delay an emergency evaluation.
For additional veterinary guidance, see Merck Veterinary Manual’s emergency warning signs and VCA’s discussion of breathing difficulty in cats. This article is educational and is not an individual diagnosis or treatment plan.
This article is for general education and is not a substitute for care from your own veterinarian. Learn about The Pet Vet and our editorial policy.