H5N1 guidance sharpens for cats, dogs, and veterinary teams

H5N1 is no longer just a poultry and dairy story for small-animal practice. Federal agencies, veterinary groups, and diagnostic experts are increasingly focused on what companion-animal clinicians should do when cats, and to a lesser extent dogs, present with compatible signs after exposure to wild birds, livestock settings, raw milk, or raw pet food. Cats remain the central concern because illness can be severe and fatal, and recent food-linked cases have pushed the issue into everyday client conversations. AVMA reporting adds scale to that concern: USDA has documented nearly 70 infections in domestic cats this year and roughly 200 U.S. cat cases since the virus appeared in late 2021. (fda.gov)

The backdrop is the wider U.S. H5N1 outbreak that expanded from wild birds into poultry and, in spring 2024, into dairy cattle. That cattle outbreak changed the companion-animal risk picture, because infected milk and farm environments created new exposure routes for cats. A 2024 CDC Emerging Infectious Diseases report described H5N1 infection in dairy cattle and farm cats, noting a high death rate in cats fed raw colostrum and milk from affected cows. CDC’s broader guidance says the virus has now been detected in a wide range of mammals, including pets such as cats and dogs, even though the overall public health risk remains low. AVMA’s recent discussion also notes that case activity has risen again alongside avian migration patterns, reinforcing that predation on infected birds and exposure to infected small mammals remain relevant risks for outdoor cats. (wwwnc.cdc.gov)

Since then, the evidence base has widened. CDC guidance for veterinarians says clinicians should consider communications that keep domestic cats indoors and discourage raw diets, including raw milk, raw meats, and commercially produced raw pet foods. FDA has gone further on the regulatory side, directing covered cat and dog food manufacturers using uncooked or unpasteurized poultry or cattle ingredients to reanalyze food safety plans and treat H5N1 as a known or reasonably foreseeable hazard. FDA says it is tracking food-associated H5N1 cases in cats in several western states and notes that cats can develop severe illness or die, while dogs appear less severely affected. (cdc.gov)

That policy shift follows a string of high-profile food-linked cases. Oregon officials tied an indoor cat’s death in December 2024 to raw frozen pet food, with genome sequencing matching virus from the food and the cat. In February 2025, Oregon and Washington warned about additional contaminated raw pet food after at least two cats were euthanized. In September 2025, FDA reported H5N1-positive lots of RAWR Raw Cat Food Chicken Eats after a San Francisco cat became infected and was euthanized. AVMA reporting adds that cats in San Francisco and Los Angeles were linked to a contaminated raw chicken diet carrying genotype B3.13, and that the product’s long sell-by window illustrated a practical problem for clinics and owners alike: H5N1 may persist in frozen or refrigerated raw diets for extended periods. Together, those incidents helped move raw pet food from a general infectious-disease concern to a specific H5N1 counseling point in practice. (apnews.com)

Expert commentary has been fairly consistent. AAHA’s reporting, citing CDC veterinary leadership and diagnostic specialists, says veterinarians who suspect H5N1 in a cat should contact the state public health veterinarian for testing recommendations, and that non-negative PCR results require NVSL confirmation before a cat is considered positive. The same coverage emphasizes PPE for veterinary teams and warns against uncooked beef or poultry products and unpasteurized dairy. ASPCApro similarly advises prompt reporting of suspect cases and staff training around exposure risks, especially for cats with access to birds, farms, raw meat, or raw dairy. (aaha.org)

Why it matters: For veterinary professionals, this is becoming a triage, infection-control, and client-education issue as much as a surveillance issue. Cats with acute neurologic disease, respiratory signs, or sudden decline now warrant a more deliberate exposure history, including questions about raw diets, hunting behavior, backyard poultry, dairy work, and household contact with livestock or wild birds. Clinics may need clearer PPE protocols, isolation workflows, and staff training for suspect feline cases. The counseling burden is also shifting: pet parents may still perceive raw diets as a wellness choice, but regulators and public health officials are increasingly treating some raw animal-source products as a meaningful H5N1 exposure route. AVMA’s recent discussion adds an important practical nuance for case workups: because contaminated raw food may remain infectious during prolonged frozen or refrigerated storage, exposure histories should include older products still being fed from home freezers, not just newly purchased diets. (aaha.org)

There’s also a One Health dimension that small-animal teams can’t ignore. CDC says there is no evidence of sustained human-to-human transmission, and the risk to the general U.S. public remains low, but people with close, prolonged, unprotected exposure to infected animals or contaminated environments are at greater risk. That means veterinarians are part of the early warning system, both for animal health and for identifying households that may need public health follow-up. A broader AVMA One Health discussion on salmonellosis makes a parallel point that is relevant here too: animal-associated pathogens do not spread only through direct animal contact, but can also persist on shared environmental surfaces and create less obvious transmission opportunities. Inference: the more companion-animal cases are linked to food or farm exposure rather than outdoor predation alone, the more small-animal practice will sit at the intersection of consumer guidance, occupational exposure screening, environmental risk awareness, and disease reporting. (cdc.gov)

What to watch: The next phase will likely center on additional raw food enforcement, more refined testing recommendations for companion animals, and closer coordination between veterinary clinics, diagnostic labs, and public health agencies as new feline cases are investigated. Expect agencies and professional groups to keep sharpening owner guidance around indoor housing, raw diet avoidance, and environmental exposure risk as the outbreak continues to evolve. (fda.gov)