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Rapid / labored breathing

Has your cat's breathing become fast and labored?

Your cat's breathing rate is noticeably faster, or breathing in/out looks like real effort, including open-mouth breathing. **This is one of the few symptoms in this whole list that counts as a true emergency requiring immediate action.** Open-mouth breathing in cats is almost always abnormal (unlike in dogs) — if you suspect breathing difficulty, go to the vet right away rather than watching and waiting at home.

Possible medical causes

  • Hypertrophic cardiomyopathy (HCM): the most common heart disease in cats; when heart failure occurs, fluid accumulates in or around the lungs, causing rapid breathing, open-mouth breathing, and weakness — most common in middle-aged to senior cats
  • Asthma: can occur at any age, often worsens during pollen season, and is characterized by wheezing, coughing, and open-mouth breathing
  • Lower respiratory infection: combined with coughing and reduced energy/appetite
  • Other possible causes include fluid in the chest cavity, lung tumors, trauma, or airway obstruction

Possible behavioral causes

    A healthy cat's resting breathing rate shouldn't exceed 35 breaths per minute. You can estimate this while your cat is sleeping or resting by counting chest/belly rises for 15 seconds and multiplying by 4.

    Warning signs — see a vet right away

    • Obvious breathing difficulty: inhaling or exhaling looks like real effort
    • Open-mouth breathing (in cats, this almost always signals an emergency)
    • Resting breathing rate clearly exceeding 35 breaths per minute
    • Frequent coughing, or a posture with the body leaning forward and the head hanging low

    Initial at-home suggestions

    • If you notice breathing difficulty, go straight to the vet — don't observe or try to manage it at home — excess stress can make symptoms rapidly worsen
    • Before heading to the vet, keep your cat as calm as possible and minimize handling and stimulation (including loud talking or forcibly picking it up)
    • If possible, count your cat's breathing rate while it's calm or sleeping and share it with your vet
    • Record when the symptom appeared and whether there was an obvious trigger at the time (intense activity, a stressful event)

    Sources: Cornell Feline Health Center. For reference only — please consult a vet.