New research has dramatically raised the bar for hamster housing - evidence shows that traditional small cages cause chronic stress and that hamsters need much larger, complex environments than commonly provided.
Hamster welfare science has undergone a revolution in the past decade. Studies using cognitive bias tests - a validated measure of subjective emotional state - demonstrate that hamsters in inadequate housing consistently show pessimistic responses, indicating negative welfare states. The traditional hamster cage sold in pet shops is now understood to be a welfare-compromising product. The mismatch between scientific understanding and retail reality remains large. Advocacy for updated retail standards, wider availability of appropriate housing and consumer education about evidence-based needs are urgent priorities.