Laboratory rats are highly social, intelligent rodents whose welfare in research settings depends critically on social housing and environmental enrichment. Understanding their needs drives better welfare standards.
Rat welfare in laboratories has improved significantly through the application of behavioral science. Social housing is now standard in progressive facilities because the evidence for its welfare benefit is overwhelming. Enriched environments — including hiding boxes, nesting material, and running wheels — reduce corticosterone levels and stereotypies. Positive reinforcement training for cooperative veterinary procedures reduces fear and stress associated with handling. Validated rat grimace scales now allow pain assessment that was previously impossible. The 3Rs framework continues to drive refinements in housing, handling, and experimental design that benefit rats while often improving data quality.