Cat Breathing Problems: Signs, Causes and When It Is an Emergency

What breathing trouble looks like in a cat

PDSA describes heavy, noisy, rapid or shallow breathing, coughing, sneezing and a runny nose as possible respiratory signs. Severe distress may include continuous panting, open-mouth breathing, pale gums, collapse and exaggerated chest or belly movement.

Cats almost always breathe through their nose. A brief open-mouth look after extreme fear can occur, but mouth breathing that persists, returns or happens at rest should be treated as an emergency rather than explained away as stress.

• Breathing that is suddenly louder, faster or more effortful than your cat's normal pattern.
• Coughing, wheezing, repeated sneezing or a change in voice.
• Standing with elbows held away from the body, stretching the neck or being unable to lie comfortably.
• Reduced ability to play, hiding, low energy or refusing food alongside the breathing change.

Common causes vets consider

Respiratory infections such as cat flu can cause sneezing and discharge, while feline asthma can cause coughing, wheezing and episodes of narrowed airways. Heart disease can lead to fast breathing or fluid build-up. Pneumonia, fluid or air around the lungs, trauma, a lodged object, anaemia, heatstroke and some cancers are other possibilities.

The same outward sign can come from very different conditions. Do not assume that a cough is asthma or that a noisy breath is a cold, and do not start leftover antibiotics, inhalers or human medicines without veterinary instructions.

What to do while arranging emergency care

Call the practice before travelling so the team can prepare and tell you where to go if your usual clinic is closed. Keep the cat in a well-ventilated carrier, minimise noise and handling, and let them choose a comfortable position. Stress can make respiratory distress worse.

Do not force food, water or medication into a cat that is struggling to breathe. Do not steam, spray essential oils or put anything into the mouth or nose. If a toxin, smoke or chemical may be involved, take the packaging or a photograph for the vet and do not delay the journey to search for a home remedy.

How your vet may investigate

A vet will first assess airway, breathing, circulation, gum colour, temperature, heart and lung sounds and the cat's level of distress. Oxygen, calming medication or other stabilisation may be needed before a full work-up; handling an unstable cat can worsen the problem.

Once safe, tests are chosen for the individual case. They may include blood tests, chest radiographs, ultrasound, heart imaging, an airway sample or CT. RVC notes that imaging and airway investigations can help distinguish pneumonia, heart failure, asthma, fluid and other causes. Treatment follows the diagnosis rather than the breathing sign alone.

Milder signs still need a prompt appointment

A cat with repeated sneezing, a runny nose, a new cough or occasional noisy breathing but no obvious distress should still be booked with a vet. Cats may compensate for a while, and early assessment can identify infection, asthma, dental disease, heart disease or another condition before it becomes an emergency.

Record when the episodes happen, how long they last, appetite and energy, and whether the cat has been exposed to smoke, aerosols, dusty litter, new cleaning products or other cats. A short video taken without disturbing the cat may help the vet, but do not delay care to obtain one.