Laboratory rats are among the most widely used research animals globally, yet their complex social and behavioural needs are frequently underserved by standard housing. Improving rat welfare in research settings benefits both the animals and the quality of scientific research.
Laboratory rats are among the most cognitively complex and socially sophisticated small mammals used in research, yet they frequently live in conditions that deny the expression of their fundamental behavioural needs. Isolated housing, bare caging, and lack of environmental complexity cause measurable physiological and psychological harm — elevated cortisol, learned helplessness, and neurological changes that can actually confound experimental results. The scientific case for improved rat welfare is therefore strong on both ethical and methodological grounds: stressed animals are not reliable research models. The Refinement arm of the 3Rs framework specifically addresses housing quality and enrichment, but implementation remains inconsistent across institutions globally.