Companion Animals and PFAS: Sentinel Species
Companion animals—particularly cats and dogs—serve as sentinel species for PFAS household exposure because they share human living environments and show measurable PFAS body burdens from the same sources that affect human occupants. Veterinary medicine is increasingly recognizing PFAS-associated health effects in companion animals with implications for both animal health and human exposure assessment.
Canine and Feline PFAS Body Burdens
Studies of companion animals in PFAS-contaminated communities show PFAS serum concentrations often exceeding human levels in the same households, reflecting higher exposure relative to body weight and different elimination kinetics. Dogs show particularly high PFAS levels attributable to floor contact behavior, non-stick cookware proximity, and consumption of PFAS-contaminated water and pet food.
Veterinary Health Effects
PFAS-exposed companion animals show elevated thyroid disease, liver abnormalities, and immune dysfunction paralleling effects documented in human epidemiological studies. Veterinary toxicologists are developing PFAS exposure guidelines for companion animals and agricultural livestock to complement human health standards.
Regulatory and Practice Implications
FDA is considering PFAS guidelines for pet food and companion animal water as awareness grows. Veterinarians in PFAS-contaminated communities should consider PFAS exposure as a contributing factor when evaluating unexplained thyroid, hepatic, or immune disorders in companion animals, and counsel pet owners on reducing household PFAS sources.