Bright Is the Most Important Word in the Question
A sneeze is just an expulsion — the nose clearing something it dislikes — and a cat who sneezes a few times while remaining bright, hungry, playful, and clear-eyed is usually showing you a nose-level event rather than an illness taking hold. Cats sneeze at dust kicked up from a freshly changed litter tray, at litter that is itself dusty or perfumed, at cigarette or vape drift, at cleaning sprays and scented candles, and at a stray seed or grass fragment inhaled during a garden patrol. They also sneeze at the start of common upper respiratory infections, which begin exactly this mildly, which is why the answer is neither alarm nor dismissal but a short, observant watch.
Telling an Irritant Sneeze From an Infectious One
Irritant sneezing tends to be situational: a burst after the tray is changed, after the bathroom is cleaned, or in one particular room, then nothing for hours. Both eyes stay clear and dry, the nose produces nothing or a little clear moisture, and the cat's appetite and mischief continue untouched. Infectious sneezing builds instead of fading. Over a day or two it is joined by watery then thicker discharge from one or both eyes, a runny nose, reduced enthusiasm for food — cats eat by smell, so a blocked nose quietly shrinks appetite — and sometimes a quieter, sleepier cat than the one you described. Fever and mouth ulcers belong to the more miserable end of these infections and are vet territory, not home watching.
What to Do During the Watching Window
Remove the obvious triggers first: switch to a low-dust, unscented litter if the tray is the suspect, ventilate rooms after cleaning, and keep sprays and diffusers away from the cat's routes. Warm food slightly so its smell carries through a stuffy nose, and keep water fresh to encourage drinking. Wipe any discharge gently with a damp cloth so she stays comfortable and you can see how much is being produced. If there are other cats, watch them too — respiratory infections travel between cats, and a second sneezer confirms the direction of travel — but there is no need to separate a bright cat from her companions over a few sneezes.
Signs the Category Has Changed
Call the vet if sneezing persists beyond a few days without improving, if discharge becomes thick or coloured, if an eye becomes red, swollen, or held closed, or if appetite drops and does not recover as the nose clears. Breathing changes outrank everything: open-mouth breathing, audible effort, or a cat who cannot settle to sleep needs prompt attention. Kittens, elderly cats, and flat-faced breeds have less margin with respiratory illness and should be seen sooner rather than watched longer, as should any cat whose sneezing follows a fight or a known injury to the face.
A Short Log Makes the Judgement Easy
The difference between fading and building is hard to feel day to day and easy to see in four lines of notes: sneezes per day roughly, eyes, nose, appetite, energy. Keeping that log, plus what the vet advised if you called, in KinsLe's Pet Passport means the next sneezing spell gets compared with this one's actual course instead of a hazy memory of it.