Cat sneezing: colds, dust and the signs that need a vet

A cat sneezing now and then is a nose doing its job. A cat sneezing fifty times a day, or for the third week running, is a different conversation. The art is telling which cat you have, and it comes down to four things: how often, how long, what comes out, and what else is wrong.

The causes divide into a tidy shortlist, dust and irritation, the respiratory viruses lumped together as cat flu, dental roots that press up into the nose, foreign bodies, and the chronic sniffles that follow an early infection. Each has a recognisable signature.

The everyday sneeze: dust, litter and household air

Before illness, consider the obvious. A cat''s nose works at floor level, which is where dust, litter particles and the residue of sprays and plug-in fresheners actually live. A new bag of dusty litter is one of the most common sneezing triggers in the species, and one of the most overlooked.

The signature is sneezing that clusters around the litter tray or follows a change in the home, new litter, building work, a scented candle habit. Discharge, if any, is clear. The cat is otherwise entirely well. Fix the air and the sneezing usually stops within the week: a low-dust, unscented litter, no aerosols near cat level, and a vacuum of the skirting-board run the cat patrols.

Cat flu: the viral duo

Most infectious sneezing in cats comes from two viruses, feline herpesvirus and calicivirus, which between them account for the great majority of what people call cat flu. Both are intensely contagious between cats, both produce sneezing, runny eyes and a muted appetite, and both usually burn out in seven to ten days with nursing care.

Two things distinguish them. Herpesvirus is the one that never really leaves: after recovery it retreats into the nerves and can flare again at times of stress, which is why some cats sneeze after every house move, boarding stay or new arrival. Calicivirus more often adds mouth ulcers and drooling to the picture. Vaccination blunts both but does not fully prevent them, a vaccinated cat can still catch a mild dose.

Home nursing is genuinely useful: warmth, steam sessions in a small bathroom to loosen congestion, strong-smelling wet food to tempt a nose that cannot smell its dinner, and gentle wiping of eyes and nose with cooled boiled water on fresh cotton for each eye. What does not help is human cold medicine of any kind, several common ingredients are dangerous to cats.

A cat flu carrier is not a sick cat; it is a well cat with a virus on standby, waiting for a stressful month.

The dental connection nobody expects

The roots of the upper teeth, particularly the canines and premolars, end a whisker''s breadth below the nasal passages. An abscessed upper tooth can therefore present as one-sided nasal discharge, sneezing and face-rubbing long before any obvious mouth sign. The classic clue is sneezing that is stubbornly one-sided, sometimes with a swelling under the eye, in a cat whose teeth have not been looked at in years.

This is one reason chronic sneezing deserves an actual examination rather than another phone consultation. If your cat has one-sided signs, the dental care guide is worth a read while you wait for the appointment.

Foreign bodies: the grass-seed season

A blade of grass or a grass seed snorted up a nostril produces one of the most distinctive presentations in general practice: sudden, violent, repeated sneezing fits, often with pawing at the face, usually one-sided, frequently starting mid-summer. The cat cannot sneeze the thing out because the nasal passage is built to resist exactly that direction of travel.

Do not wait these out. A foreign body that does not exit within a day or two migrates or infects, and removal under sedation is quick and kind. The signature, sudden onset, dramatic fits, one nostril, is distinctive enough that your vet will ask about it first.

Chronic rhinitis: the lifelong sniffle

Some cats sneeze on and off for life. The usual history is a severe bout of cat flu in kittenhood that scarred the delicate scrollwork inside the nose, leaving passages that block easily, drain poorly and host low-grade bacterial overgrowth. These cats snuffle, sneeze coloured discharge in bouts, and are otherwise well.

Chronic rhinitis is managed, not cured. What helps: steam, saline nose drops if your vet approves them, low-dust litter, weight kept lean, and prompt treatment of flare-ups. What does not help: repeated short courses of antibiotics with no work-up. A cat who has been sneezing for months deserves one proper investigation, examination under sedation, imaging, possibly a flush and culture, after which management becomes far more targeted.

The sneeze sorter

Four questions, how often, how long, what colour, what else, sort most sneezing cats into watch at home, phone today, or go now.

The verdict, by household

The occasional sneezer, otherwise bouncing. Dust check: litter, sprays, candles. Watch for a week. Done.

The new sneezer with runny eyes and a reduced appetite. Mild cat flu, most likely. Nursing care, steam, smelly food, and a vet call if the appetite drops further or the eyes look sore rather than merely wet.

The cat with fits out of nowhere in summer. Foreign body until proven otherwise. Phone the vet today.

The months-long snuffler. Chronic rhinitis work-up time. One good investigation beats a year of guesswork.

The one-sided sneezer with bad teeth. Dental root involvement is high on the list. Examination and probably a dental under anaesthesia.

When to call your vet

The lines are fairly clear. Same day: open-mouth or laboured breathing, blood from the nose, a kitten or elderly cat who is flat and off food, or any cat not eating for 24 hours. Phone within a day or two: coloured discharge, sneezing fits, sore or squinting eyes, or sneezing that passes the ten-day mark. Watch comfortably at home: occasional sneezes, clear discharge, a cat who is eating, playing and entirely itself.

Frequently asked questions

The questions below are the ones typed into search bars, duration, home remedies, contagion, and the kitten question.