Cats are fundamentally territorial animals, and multi-cat households frequently create chronic social stress that owners fail to recognize because overt conflict is rare.
Chronic stress in multi-cat households represents a major and underrecognized welfare problem affecting millions of cats. Because cats rarely engage in dramatic fights — preferring subtle intimidation and resource blocking — owners often do not recognize that one or more cats in their household are experiencing persistent psychological stress. Cortisol levels, behavioral changes, and clinical signs like idiopathic cystitis all reflect this stress. Welfare improvement requires recognizing that cats need access to resources without social competition, and that the number of cats in a household should not exceed what the available space and resources can support.