Lab Rodent Pain Recognition | Animal Welfare Hub

How validated pain assessment tools for laboratory mice and rats are improving welfare standards in biomedical research.

Key Facts

Mice and rats are the most commonly used laboratory animals globally, numbering over 100 million annually
The Mouse Grimace Scale provides validated facial action coding for acute pain assessment
Undertreatment of pain in laboratory rodents is recognized as both a welfare failure and a scientific confound
Pain alters rodent behavior, physiology, and study outcomes, making pain management scientifically essential
The 3Rs framework requires minimization of pain and distress as a core refinement principle

Welfare Considerations

Pain recognition and management in laboratory rodents has advanced significantly with the development of validated behavioral and facial expression scales. However, implementation remains inconsistent across research institutions. Pain that is unrecognized and untreated not only constitutes a welfare failure but compromises research reproducibility, as pain-related physiological changes confound experimental results. This dual imperative — welfare and science quality — is driving improved pain management protocols.

What You Can Do

Support institutional animal care and use committees that enforce strong pain management protocols
Advocate for mandatory pain assessment training for laboratory animal personnel
Donate to organizations developing non-animal alternatives to reduce rodent use in research
Engage with open science initiatives that share refinement techniques for rodent welfare