A dog panting after a run on a warm day is often cooling itself. A dog who begins heavy panting while resting on a cool floor, seems panicked, or cannot settle deserves closer attention. The pattern matters: panting is a behavior, not a diagnosis.
Watch for distress rather than counting breaths alone
Collapse, blue or very pale gums, obvious difficulty breathing, seizures, or signs of heatstroke require emergency care. Heavy panting with a painful, swollen abdomen or repeated attempts to vomit without producing anything is also an emergency. Don’t wait for a virtual appointment if breathing is labored.
What can make panting change?
Heat, exercise, excitement, anxiety, pain, fever, medication effects, and diseases affecting the lungs or heart can contribute. A change in panting should be considered alongside appetite, energy, coughing, ability to walk, and recent heat exposure. A short video can illustrate the behavior if your dog is stable, but it cannot measure oxygen levels.
What to do immediately
Stop exertion, move into a comfortably cool area, and offer water if the dog is fully alert and able to drink normally. If overheating or heatstroke is suspected, call an emergency clinic for cooling and transport guidance while leaving for care. Do not force water, use human sedatives, or delay emergency evaluation to see whether a home remedy works.
What to tell your vet
Include the timing of the panting, activity level, temperature and humidity, any coughing, medication changes, pain, or previous heart and lung conditions. Mention whether symptoms settle with rest or recur overnight. Your clinician will decide if examination or testing is needed.
For younger dogs, read our puppy panting overview. For breathing concerns in cats, see cat panting emergency signs.
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.