The reasons why cats open their mouths and pant may be as follows: The surrounding environment temperature is too high: Cats’ sweat glands are underdeveloped and their heat dissipation ability is weak, so when the surrounding environment temperature is too high, cats will open their mouths and pant to dissipate heat. Especially in summer, if your cat often opens its mouth to pant, it may be a precursor to heat stroke. Stress response: When a cat is too nervous or is suddenly frightened, it may cause its heartbeat to accelerate, its body temperature to rise, and a series of stress reactions, including opening its mouth to adjust its breathing. This may happen when the cat suddenly changes to a new environment or hears a loud noise.

Hypoxia: When a cat is hypoxic, it cannot inhale enough oxygen through nasal breathing alone, so it will open its mouth and gasp. to increase oxygen supply. This may be caused by the cat suffering from respiratory disease, asthma, pneumonia, heart disease, etc.

Other physical problems: Cats have a ruptured diaphragm or palate, causing difficulty breathing and may also open their mouth to breathe. In addition, if a cat opens its mouth to pant for a long time, it may be related to chronic diseases of the heart or respiratory system.