H5N1 in companion animals puts cats, raw diets, and clinics in focus

H5N1 is no longer just a poultry or wildlife story for small animal practice. U.S. veterinary and public health guidance now makes clear that companion animals, especially cats, can become infected through contaminated raw pet food, unpasteurized milk, infected birds, predation on infected small mammals, and exposure associated with dairy or poultry environments. At the same time, the FDA has directed covered pet food manufacturers using uncooked or unpasteurized poultry or cattle ingredients to reanalyze their food safety plans and explicitly account for H5N1 risk. (fda.gov)

That shift follows a year of expanding evidence. In 2024, researchers linked H5N1 infections in dairy cattle and cats on affected farms, with epidemiology and viral similarity pointing to raw milk exposure as a likely route in some feline cases. CDC later reported infections in indoor-only household cats in Michigan connected to dairy worker households, underscoring that companion animal exposure may occur even when pets never go outdoors. AVMA’s Veterinary Vertex recently highlighted how quickly the epidemiology continues to change, noting USDA has documented nearly 70 infections in domestic cats this year and roughly 200 U.S. cat cases since late 2021, with case activity rising again alongside avian migration patterns. The agency now advises veterinarians to consider H5N1 in cats presenting with respiratory or neurologic illness in areas where the virus is circulating in cattle, poultry, or other animals. (vet.cornell.edu)

The foodborne risk has become harder to ignore. FDA says it is tracking H5N1 cases in domestic and wild cats in multiple western states associated with contaminated food products, and notes that cats can become severely ill or die after consuming uncooked meat, unpasteurized milk, or eggs that have not gone through a virus-inactivating step such as cooking, pasteurization, or canning. New York state, citing testing by Cornell and USDA’s National Veterinary Services Laboratories, warned consumers not to feed recalled Savage Cat Food chicken products after samples from the implicated lot were confirmed positive for H5N1. Earlier case reports and recalls tied other raw diets to feline illness and death, reinforcing that this is not a one-off signal. AVMA reporting added an important practical detail for clinicians and clients: one contaminated raw chicken diet linked to cat deaths in California carried a sell-by date extending to 2026, underscoring that H5N1 may remain viable for long periods in frozen or refrigerated raw products and that exposure windows may be longer than owners assume. (fda.gov)

Expert and industry commentary has converged on a similar message: cats are the main companion animal concern, and veterinary teams should think in terms of both patient care and occupational safety. Cornell’s College of Veterinary Medicine advises pet parents to discontinue raw diets, avoid raw milk, and seek prompt care for signs including lethargy, fever, ocular or nasal discharge, dyspnea, tremors, seizures, or sudden blindness. AAHA has also highlighted the need for a risk-based approach in practice, including stronger PPE use and attention to the possibility, even if still undocumented in this outbreak, that close contact with infected cats could pose a human exposure risk. (vet.cornell.edu)

Why it matters: For practicing veterinarians, H5N1 now sits at the intersection of triage, diagnostics, client communication, infection control, and public health coordination. Cats with neurologic disease may be mistaken for other conditions, including rabies, and outside experts have argued that limited companion animal surveillance means some cases are probably being missed. That makes exposure history especially important: ask about raw food, raw milk, hunting behavior, backyard poultry, wildlife contact, and whether anyone in the household works with dairy cattle or poultry. CDC specifically recommends obtaining occupational information from household members to guide One Health investigations and reduce unprotected staff exposures. AVMA’s recent discussion also reinforces that predation remains a real route of exposure for cats because H5N1 continues to circulate in wild birds and mammals such as house mice, not just in agricultural settings. (statnews.com)

The regulatory angle matters, too. FDA’s requirement that certain pet food manufacturers revisit food safety plans signals that H5N1 is becoming embedded in routine hazard analysis for animal food, not treated as an isolated outbreak issue. For clinics, that may support more direct counseling against raw feeding while giving veterinarians firmer footing when discussing diet risk with pet parents who see raw products as premium or natural. It also suggests manufacturers, distributors, and retailers will face continued pressure to document sourcing, processing, and preventive controls. (fda.gov)

What to watch: The next phase will likely include more case detection in cats, continued recalls or advisories involving raw animal products, and sharper guidance for clinics on testing, PPE, and reporting pathways. USDA has stressed that biosecurity remains the best defense across animal settings, and broader surveillance efforts may determine whether companion animals are an undercounted part of the outbreak rather than a fringe concern. As more investigators focus on raw diet–associated cases, veterinarians may also need to warn clients that contaminated products stored frozen or refrigerated could remain a source of exposure long after they were bought. (aphis.usda.gov)