Can cats actually catch a cold, and is it contagious to other cats?

Cats cannot catch the rhinoviruses that cause the human common cold, but they routinely develop a clinically similar illness veterinarians call feline upper respiratory infection, or URI. The Cornell Feline Health Center reports that feline herpesvirus-1 and feline calicivirus together account for roughly 80 to 90 percent of these infections, with Bordetella bronchiseptica, Chlamydia felis, and Mycoplasma species responsible for most of the remainder (Cornell Feline Health Center, 2023). Because these pathogens spread through sneezed respiratory droplets, shared food and water bowls, and contaminated bedding, URIs move quickly through group housing.

Contagion risk is highest where cats live in close quarters with imperfect ventilation, which is why shelters and rescue facilities see the most frequent and hardest-to-contain outbreaks (ASPCA, n.d.). A cat can shed virus for one to three weeks after visible signs resolve, and herpesvirus-infected cats can become lifelong latent carriers who shed the virus again during stressful periods such as boarding, moving, or a new animal joining the household (Cornell Feline Health Center, 2023).

What are the first signs owners notice when a cat is coming down with a cold?

The earliest signs are usually paroxysmal sneezing and a clear, watery nasal or ocular discharge that owners often mistake for allergies. Within a day or two, the discharge frequently thickens and turns yellow or green as secondary bacterial involvement sets in, and many cats develop a low-grade fever in the 103 to 105 degrees Fahrenheit range, well above the normal feline baseline of about 100.5 to 102.5 degrees (Merck Veterinary Manual, 2022).

Appetite loss is one of the most clinically important early signs because cats rely heavily on smell to trigger eating, and a congested nose can shut down interest in food within 24 to 48 hours. Kittens and cats infected with calicivirus may also develop oral or tongue ulcers that make chewing painful, and some calicivirus strains cause mild lameness from joint inflammation, sometimes called limping kitten syndrome (Cornell Feline Health Center, 2023).

What actually causes a cat cold, and which cats are most at risk?

Feline herpesvirus-1 and feline calicivirus are the two dominant causes, transmitted primarily through direct nose-to-nose contact and aerosolized droplets from sneezing, though the viruses can also survive on surfaces such as bowls, bedding, and human hands for up to a day in the case of calicivirus (Merck Veterinary Manual, 2022). Kittens between 8 and 12 weeks old are especially vulnerable because maternal antibodies are waning just as they encounter new cats at shelters or breeders.

Unvaccinated cats, cats recently adopted from crowded shelters, and cats under chronic stress carry the highest risk, since cortisol elevation is known to reactivate latent herpesvirus in cats that were infected earlier in life and appeared fully recovered (Cornell Feline Health Center, 2023). Senior cats, cats with feline immunodeficiency virus or feline leukemia virus infection, and brachycephalic breeds such as Persians and Himalayans also tend to have more severe or prolonged episodes because of pre-existing airway anatomy or immune suppression.

How does a veterinarian actually diagnose a cat cold versus something more serious?

Most cases are diagnosed on physical exam and history alone, since the pattern of sneezing, ocular discharge, and mild fever in an otherwise young, unvaccinated, or recently rehomed cat is highly characteristic. When symptoms are severe, recurrent, or unresponsive to initial treatment, veterinarians may run PCR panels on eye or nasal swabs that can distinguish herpesvirus, calicivirus, Chlamydia felis, Mycoplasma, and Bordetella in a single test (Cornell Feline Health Center, 2023).

Veterinarians also look for complicating conditions that mimic or worsen a simple URI, including dental disease, nasal foreign bodies, fungal infections such as cryptococcosis, and nasopharyngeal polyps, particularly in cats whose sneezing or discharge lasts beyond the typical seven-to-ten-day course. Bloodwork and chest radiographs are added when a cat is lethargic, feverish above 105 degrees Fahrenheit, or showing labored breathing that raises concern for pneumonia (Merck Veterinary Manual, 2022).

What treatments do vets actually use for a cat with a cold?

Because most URIs are viral, there is no drug that cures the infection outright; treatment is supportive and aimed at preventing secondary bacterial infection and dehydration. Vets commonly prescribe a broad-spectrum antibiotic such as doxycycline when discharge turns thick and colored, since that pattern suggests bacterial overgrowth on top of the primary virus (Merck Veterinary Manual, 2022). For cats with herpesvirus flare-ups, oral famciclovir has become a standard antiviral option and is generally well tolerated, according to dosing guidance published by veterinary ophthalmology and internal medicine specialists.

Cats that stop eating for more than 24 hours may need appetite stimulants such as mirtazapine, subcutaneous fluids for dehydration, or short-term hospitalization with a feeding tube in severe cases. Eye involvement, including corneal ulcers from herpesvirus, typically requires a topical antiviral or antibiotic ointment and fluorescein staining to confirm the ulcer isn't progressing (Cornell Feline Health Center, 2023).

How can I make my cat more comfortable and help clear congestion at home?

Running a cat in a steamy bathroom for 10 to 15 minutes a few times a day helps loosen nasal secretions, and gently wiping crusted discharge from the eyes and nose with a warm, damp cloth keeps the airway clearer and prevents skin irritation. Warming canned food slightly or offering strong-smelling options like tuna or warmed chicken broth can coax a congested cat to eat when its sense of smell is blunted (Cornell Feline Health Center, 2023).

A cool-mist humidifier in the cat's sleeping area, a quiet low-stress environment, and separation from other cats in the household for 10 to 14 days all reduce both discomfort and transmission risk. Owners should avoid human decongestants and cold medications entirely, since drugs like pseudoephedrine and acetaminophen are toxic to cats even in small doses (ASPCA, n.d.).

How likely is my cat to fully recover, and can this come back later?

Most otherwise healthy adult cats recover fully within seven to ten days with supportive care, but herpesvirus in particular establishes lifelong latency in nerve tissue, meaning a cat can appear cured and still carry the virus indefinitely. The Cornell Feline Health Center estimates that a large proportion of cats exposed to herpesvirus become chronic carriers who shed the virus intermittently, especially during stress, boarding, surgery, or the arrival of a new pet (Cornell Feline Health Center, 2023).

Kittens with severe early calicivirus or herpesvirus infection can be left with permanent nasal scarring that predisposes them to chronic sinusitis, sometimes requiring lifelong management with periodic antibiotics or nebulization. Annual FVRCP vaccination, recommended by AAHA feline vaccination guidelines, does not prevent all infection but substantially reduces the severity and duration of symptoms in cats that do become exposed (American Animal Hospital Association, 2020).