H5N1 risk in cats puts companion animal care on alert

CURRENT FULL VERSION: H5N1 avian influenza is now a companion-animal issue that small animal teams can’t afford to treat as peripheral. What began as a poultry outbreak has widened into a multispecies event that includes dairy cattle, wildlife, captive mammals, raw pet food recalls, and documented illness in domestic cats. Federal guidance has sharpened accordingly: the FDA says certain pet food manufacturers must account for H5N1 in their food safety plans, while CDC guidance for veterinarians now specifically discourages feeding raw diets, including raw milk, raw meat, and commercially produced raw pet foods, to cats and dogs. AVMA experts say the pace of change has been rapid, with nearly 70 domestic cat infections documented by USDA this year alone and roughly 200 U.S. cat cases reported since the virus appeared in the country in late 2021. (fda.gov)

The backdrop is the expanding U.S. H5N1 outbreak in mammals after dairy cattle infections were first reported in March 2024. Since then, concern has grown that companion animals can be exposed through multiple routes, not just direct contact with birds. USDA has warned that cats can be infected through consuming infected birds or other animals, as well as unpasteurized or raw milk from infected cows. CDC has similarly emphasized avoiding exposure to contaminated raw milk and other animal materials, reflecting a broader One Health shift in how companion-animal risk is being framed. AVMA commentary adds that ongoing circulation in wild birds and mammals such as house mice means predation remains an important route of exposure for cats, especially as cases rise again with avian migration patterns. (aphis.usda.gov)

The clearest operational change for the veterinary sector may be in pet food oversight. In late 2024, the FDA said manufacturers covered by the Food Safety Modernization Act’s Preventive Controls for Animal Food rule and using uncooked or unpasteurized poultry or cattle ingredients must reanalyze their food safety plans to include H5N1 as a known or reasonably foreseeable hazard. The agency pointed to domestic and wild cat cases in California, Colorado, Oregon, and Washington tied to contaminated food products, and noted that cats can experience severe illness or death. That regulatory message was reinforced by multiple raw-food-linked cat illness events, including Oregon cases tied to Wild Coast Raw and other reported recalls involving contaminated raw cat food. AVMA experts also emphasized a practical concern for clinicians and clients: H5N1 can persist in contaminated raw diets stored frozen or refrigerated for extended periods, so products may remain hazardous long after purchase; in one California-linked event, contaminated raw chicken food associated with feline deaths reportedly carried a sell-by date extending into 2026. (fda.gov)

Clinical concern is also rising because companion-animal cases may present in ways that are easy to miss early. CDC’s report on indoor cats in Michigan dairy worker households described decreased appetite, lethargy, disorientation, respiratory signs, and progressive neurologic deterioration. The agency advised veterinarians in affected regions to ask about household members’ work with dairy cattle or poultry, use PPE when handling suspect animals, and involve state and federal officials quickly when H5N1 is on the differential. A later CDC Emerging Infectious Diseases report added another warning signal: domestic cats became infected after consuming commercial raw milk, and the authors said veterinarians should consider H5N1 when cats with raw poultry or dairy exposure present with acute neurologic signs. AVMA discussion of recent feline cases also underscored that owners feeding raw diets may not recognize frozen or refrigerated products as an influenza risk, which raises the stakes for clear counseling in exam rooms. (cdc.gov)

Outside government, expert commentary has focused on how little systematic surveillance exists for pets. A March 2025 STAT analysis by veterinarians and One Health experts argued that companion-animal surveillance remains fragmented and underpowered, even as cats may serve as sentinels for broader transmission risks. The piece noted that some states have added H5N1 testing to routine rabies testing pathways and said AVMA now recommends considering both rabies and H5N1 in animals with neurologic disease. The core concern is that sick cats may be one of the first visible signs of exposure in households connected to dairy, poultry, wildlife, or contaminated raw products. That broader framing aligns with AVMA’s One Health messaging in other zoonotic disease discussions, which emphasizes that animal, human, and environmental interfaces can create transmission pathways that are easy to overlook if clinicians focus too narrowly on foodborne or direct-contact risk alone. (statnews.com)

Why it matters: For practicing veterinarians, this changes both history-taking and client communication. Cats with acute neurologic or respiratory signs now warrant more detailed questions about diet, including raw pet food and raw milk, outdoor hunting, contact with wild birds, and whether anyone in the household works with dairy cattle or poultry. Infection-control planning matters, too: CDC says veterinary staff should use precautions when examining suspect animals, and public health coordination may be needed to protect clinic staff and exposed household contacts. Just as important, this is a risk communication moment with pet parents. The clearest preventive advice from federal agencies is to avoid raw animal-source diets and unpasteurized dairy for pets, especially cats. AVMA reporting adds another useful point for those conversations: because contaminated raw products may stay infectious during frozen or refrigerated storage, “old” food in a freezer should not be assumed safe simply because it has been stored for a long time. (www-new.cdc.gov)

There’s also a business and policy angle. The FDA’s food safety directive signals that H5N1 is moving from an outbreak headline to a compliance issue for segments of the pet food supply chain. At the same time, recurring recalls and public alerts tied to raw products suggest the veterinary profession may face more questions from pet parents about diet safety, testing, and whether indoor-only cats are really protected. The answer, increasingly, is that indoor status alone doesn’t eliminate risk if contaminated food or take-home occupational exposure is involved. Ongoing wildlife circulation means it also doesn’t eliminate risk in households where cats still have opportunities for predation or indirect exposure to infected animals. (fda.gov)

What to watch: The next phase will likely center on better companion-animal surveillance, more refined testing recommendations, and whether regulators take additional steps around raw pet food and dairy-linked exposures as new feline cases and food investigations emerge. Seasonal increases linked to bird migration and continued circulation in wildlife and small mammals may keep pressure on veterinarians to stay alert even when dairy-linked headlines fade. (statnews.com)