How feline upper respiratory infections cause significant welfare suffering, particularly in shelter environments, and how prevention and management can reduce this burden.
Feline URI causes acute suffering — inflamed eyes, congested nasal passages, painful mouth ulcers, and reduced ability to smell food (which strongly suppresses appetite in cats) combine to make affected cats genuinely miserable. In shelters, URI outbreaks affect large numbers of animals simultaneously, overwhelming treatment capacity and extending length of stay. The welfare paradox is that the stress of shelter entry triggers viral reactivation in latently infected cats, creating a cycle where the animals most in need of safe housing are most vulnerable to infection. Prevention requires both vaccination and stress reduction — fast pathways through the shelter system, adequate isolation, and foster networks that keep vulnerable animals out of high-density shelter environments. At home, multi-cat households and new additions are common triggers for reactivation in previously recovered cats.