A cat's meow can change pitch for several reasons:
Age: Aging can alter the vocal cords, leading to a higher-pitched meow.
Health Issues: Upper respiratory infections or thyroid problems may change the sound.
Excitement or Stress: Emotional states can make the meow higher-pitched.
Vocal Range: Cats naturally have different vocal ranges.
Breed Differences: Some breeds have distinct meow characteristics.
If the change is sudden or concerning, consult a veterinarian to rule out medical conditions.