Designer Mixes
Article • Designer Mixes

My Cat Has a Cold

Shari Shidate
Shari Shidate Designer Mixes contributor

First, take a breath

If your cat is sneezing, has a runny nose, or sounds a little congested, it can look a lot like a human cold. In cats, we usually call this an upper respiratory infection (URI). Many URIs are mild, but some can become serious quickly, especially in kittens, seniors, and cats with other health issues.

I am a veterinary assistant in Frisco, Texas, and one thing I want you to know right away is this: you do not have to guess. You can monitor closely at home for a short time, and you can also know exactly when it is time to call your vet.

What a “cold” usually is

Most feline “colds” are caused by viruses, especially feline herpesvirus-1 and feline calicivirus. In shelters and multi-cat homes, other infectious causes can also contribute, including Bordetella bronchiseptica, Chlamydia felis, and Mycoplasma species.

These infections are mainly spread through respiratory and eye secretions and close contact (grooming, shared bowls, nose-to-nose greetings, sneezes). Germs can sometimes spread on surfaces and hands too, although how long they survive outside the body varies.

Sometimes bacteria join in after the virus starts (a secondary bacterial infection), which is one reason symptoms can worsen over time.

Typical symptoms

  • Sneezing
  • Runny nose (clear, then sometimes thicker)
  • Watery eyes or eye discharge
  • Congestion or noisy breathing through the nose
  • Lower energy
  • Reduced appetite (often because smell is blocked)
  • Mouth ulcers (more common with calicivirus)

Is it contagious?

Often, yes. If you have more than one cat, it is smart to separate the sick cat when possible, wash your hands between cats, and avoid sharing bowls and bedding until things improve.

Vaccines help reduce severity and spread, but they do not always prevent infection completely.

Could it be something else?

Several issues can mimic a URI. This is why a quick vet call is never a bad idea if you are unsure.

  • Allergies or irritants: dust, smoke, scented litter, essential oil diffusers, strong cleaners.
  • Dental disease: tooth root infections can cause nasal discharge, especially from one nostril.
  • Foreign material: a blade of grass or plant material can trigger sudden sneezing and one-sided discharge.
  • Asthma: coughing and wheezing are more typical than sneezing.
  • Pneumonia: can occur after or alongside a URI and needs veterinary care.
  • Chronic or structural issues: if discharge is ongoing, keeps coming back, or is mostly one-sided, your vet may consider things like nasal polyps, a mass, or (in some areas) fungal disease such as cryptococcosis.

When to call the vet now

Some cats can be monitored at home for a day or two, but certain signs mean you should call your veterinarian promptly, the same day if possible.

  • Not eating for 24 hours (or noticeably eating much less), especially in kittens
  • Labored breathing, open-mouth breathing, or belly heaving
  • Gums that look pale, blue, or gray
  • Severe lethargy (not getting up, hiding more than usual, weak)
  • Eye problems: squinting, thick yellow-green discharge, swollen eyelids, cloudy eye surface
  • Fever suspected (hot ears are not a reliable test), or your cat feels unusually warm and “off”
  • Kittens, seniors, pregnant cats, or immunocompromised cats with any URI symptoms
  • Cats with known heart or lung disease who develop congestion, coughing, or breathing changes
  • Symptoms lasting longer than 7 to 10 days, improving then getting worse, or repeatedly returning

Important: if your cat is struggling to breathe, that is an emergency. Do not wait and see.

Safe home care

For mild cases, supportive care can make a huge difference. Your goal is to help your cat breathe easier, stay hydrated, and keep eating.

1) Hydration

  • Offer fresh water in multiple places.
  • Consider adding wet food, or mixing a little warm water into canned food.
  • If your vet okays it, low-sodium broth made for pets can encourage drinking.

2) Calories

Because cats rely on smell to eat, congestion can shut down appetite. Try these tips:

  • Warm the food slightly to increase aroma (test temperature with your finger first).
  • Offer smelly, soft options like pate-style wet food.
  • Feed small meals more often.
  • If your cat will not eat, call your vet sooner rather than later. Cats can develop serious complications if they stop eating (including hepatic lipidosis).

3) Humidity

  • Run a cool-mist humidifier in the room where your cat rests.
  • Steam therapy: sit with your cat in a bathroom with a hot shower running for 10 to 15 minutes. Keep your cat calm and safe, and never leave them unattended.

4) Eyes and nose

  • Use a soft cotton pad or clean cloth with warm water to gently wipe discharge.
  • Use a fresh pad for each eye to reduce spreading infection.

5) Quiet and rest

Stress can flare feline herpesvirus. Keep the environment quiet and cozy, and if you have multiple cats, separate the sick cat when possible to reduce spread.

What not to do

  • Do not give human cold medicine. Many products are toxic to cats.
  • Do not give human pain relievers like acetaminophen or ibuprofen. These can be fatal to cats.
  • Do not use essential oils on or around your cat to “open airways.” Cats are very sensitive to many oils.
  • Do not use menthol products like vapor rubs, vapor patches, or heavily scented “decongestant” sprays. These can irritate airways and some ingredients can be harmful if licked or inhaled.
  • Do not force-feed unless your veterinarian has shown you how and has recommended it.

How a vet may treat it

Treatment depends on your cat’s exam findings and how sick they are.

  • Supportive medications for nausea, appetite support, or pain relief (especially if mouth ulcers are present)
  • Eye medications if conjunctivitis or corneal issues are present
  • Antibiotics if a secondary bacterial infection is suspected (viruses themselves do not respond to antibiotics)
  • Antiviral therapy in select cases, especially with herpesvirus-related eye disease
  • Fluids if dehydrated
  • Hospitalization and oxygen support for severe cases

A quick exam can also rule out more serious conditions and help you feel confident you are on the right track.

How long it lasts

Mild URIs often improve within about 1 to 2 weeks. Some cats, especially those with herpesvirus, may have flare-ups during stress or seasonal changes. If symptoms persist longer than expected, or keep returning, your vet may discuss long-term management strategies.

Prevention

  • Vaccination helps reduce severity and spread of common URI viruses.
  • Good hygiene: wash hands between cats, wash bowls, and clean surfaces.
  • Lower stress: predictable routines, safe hiding spots, gradual introductions with new pets.
  • Air quality: avoid smoke, heavy fragrances, and dusty litter.
The goal is not perfection. The goal is catching problems early, keeping your cat comfortable, and getting veterinary help quickly when the signs say it is time.

Quick checklist

Monitor at home

  • Still eating at least some food
  • Normal breathing (no open-mouth breathing, no struggle)
  • Bright enough to interact a little

Call your vet

  • Not eating for 24 hours, or drinking very little
  • Thick yellow-green discharge from nose or eyes
  • Eye squinting or swollen eyelids
  • Very young, older, medically fragile, or heart or lung disease history
  • Symptoms lasting more than 10 days, or improving then getting worse

Emergency

  • Open-mouth breathing, severe breathing effort, or collapse
  • Blue or gray gums
{recommendations:3}