The Feline "Cat Cold" — What It Actually Is
When a cat develops a runny nose, weepy eyes and a general air of misery, owners often describe it as a cat cold, and in many respects the comparison is apt. Feline upper respiratory infection, or URI, refers to a group of conditions affecting the nose, throat and sinuses — the upper portions of the respiratory tract. It is extraordinarily common, particularly in cats with a history of shelter living, early weaning or multi-cat environments.
However, unlike the human cold which is caused by a relatively large pool of viruses, feline URI is dominated by a small number of well-characterised pathogens, each with its own tendencies and implications for long-term health.
What Causes Feline Upper Respiratory Infections?
Two viruses account for the overwhelming majority of feline URI cases.
Feline Herpesvirus Type 1 (FHV-1)
Also known as feline viral rhinotracheitis, FHV-1 is responsible for roughly half of all feline URI cases. It causes significant inflammation of the nasal passages and conjunctivae, and tends to produce more severe symptoms than calicivirus. Crucially, once a cat is infected with herpesvirus, the virus persists for life within nervous tissue and can reactivate during times of stress or immunosuppression. This explains why some cats suffer recurrent bouts of sneezing and eye discharge throughout their lives.
Feline Calicivirus (FCV)
Calicivirus accounts for most of the remaining viral URI cases. It typically causes ulcers in the mouth and on the tongue alongside the classic respiratory symptoms, and some strains produce joint pain — giving affected cats a distinctive limp during the acute phase of illness. Calicivirus does not establish lifelong latency in the same way as herpesvirus, though some cats do become chronic carriers.
Bacterial Causes
Chlamydophila felis and Bordetella bronchiseptica are the most clinically significant bacterial contributors to feline URI. They often act as secondary infections on top of viral illness, worsening symptoms and prolonging recovery. Bacterial infections tend to produce thicker, more coloured discharge than uncomplicated viral infections.
Recognising the Symptoms
The typical presentation of feline URI includes:
- Sneezing, often in clusters or bouts
- Nasal discharge ranging from clear to yellow or green
- Eye discharge, redness or squinting
- Reduced appetite and weight loss
- Lethargy and reduced activity
- Fever
- Mouth ulcers or drooling (more common with calicivirus)
- Breathing through the mouth in severe cases
Cats rely heavily on their sense of smell to stimulate appetite. When nasal congestion blocks scent detection, even favourite foods become unappealing. This loss of appetite is one of the most concerning aspects of URI in cats, as it can lead to a dangerous condition called hepatic lipidosis — fatty liver disease — if a cat stops eating for more than a few days.
How Long Does Feline URI Last?
In otherwise healthy adult cats, an uncomplicated URI typically runs its course within seven to fourteen days. Kittens, elderly cats and those with underlying health conditions may experience more severe illness and a longer recovery period.
Cats with herpesvirus may have recurring episodes, each typically lasting one to two weeks. The frequency of these recurrences varies between individuals — some cats flare up only occasionally, while others seem perpetually affected. Stress is the most reliably identified trigger, and management strategies aimed at reducing environmental stress can significantly influence the pattern of recurrence.
When to See a Vet
Not every cat with a sniffly nose needs immediate veterinary attention, but certain signs warrant prompt assessment:
- Refusal to eat or drink for more than 24 hours
- Open-mouth breathing or obvious difficulty breathing
- Symptoms persisting beyond ten to fourteen days without improvement
- Green or yellow discharge from both nose and eyes
- Extreme lethargy or inability to stand
- Any respiratory illness in kittens under six months of age
Kittens should always be seen promptly, as they decompensate rapidly and URI can be life-threatening in very young cats.
Home Care for Cats with URI
Supportive care at home makes a significant difference to comfort and recovery speed, even when veterinary treatment is not required.
Maintaining Hydration and Appetite
Offering warmed, strong-smelling wet food can help entice a congested cat to eat. Warming food releases more aromatic compounds, partially compensating for reduced nasal function. Offering small meals frequently is preferable to leaving large portions that go stale. If your cat is not drinking adequately, offering a cat water fountain or adding water to food can help maintain hydration.
Clearing Nasal Congestion
Steam inhalation can offer temporary relief. Sitting with your cat in a steam-filled bathroom for ten to fifteen minutes several times daily helps loosen nasal secretions and makes breathing more comfortable. Never use essential oils or menthol products near cats, as these are toxic.
Gently wiping nasal and ocular discharge with a clean, damp cloth prevents crusting and reduces discomfort. Use a separate cloth for the nose and each eye to avoid cross-contamination.
Rest and a Calm Environment
Providing a warm, quiet space for recovery allows your cat to rest without stress. If you have other pets in the household, keeping the sick cat separated reduces stress and prevents transmission of the infection.
Vaccination and Prevention
Core feline vaccinations include protection against both herpesvirus and calicivirus, and while they do not prevent infection entirely, they significantly reduce the severity of illness. Keeping vaccinations current is one of the most straightforward things you can do to protect your cat's respiratory health throughout their life.