Hamsters are widely kept as pets but routinely housed in conditions far too small for their complex behavioral needs, leading to chronic stress and stereotypic behavior.
Hamster welfare is one of the most overlooked areas of companion animal care. The tiny, brightly colored cages commonly sold in pet stores are wholly inadequate for a species that is built for expansive nocturnal activity. In undersized cages, hamsters develop stereotypic bar-chewing, repetitive pacing, and excessive wheel-running as coping mechanisms for frustration and stress. Welfare improvements include providing deep substrate for burrowing (at least 20 cm), a large wheel of appropriate diameter, scatter feeding for foraging enrichment, and a cage with sufficient floor space. Germany and Sweden have already enacted minimum housing standards for pet hamsters, and advocacy is growing in other countries.