Veterinary Pain Ladder: Applying Evidence-Based Analgesia Across Animal Species

Human medicine uses a WHO pain ladder for systematic pain management. Animal medicine is developing equivalent frameworks to ensure all animals receive appropriate pain relief.

Key Facts

The World Health Organization pain ladder for human medicine provides a stepwise framework for matching analgesic choice to pain severity — an equivalent framework for animals is being developed
NSAIDs (non-steroidal anti-inflammatory drugs) are the most widely used analgesics in veterinary practice but are contraindicated in some species and may have adverse effects at high doses
Opioids are highly effective for moderate to severe pain in animals but are under-utilised due to controlled drug regulations, cost, and historical reluctance
Local anaesthesia for routine procedures including castration, dehorning, and wound suturing is underused in farm animal contexts despite clear evidence for pain reduction
Species differences in drug metabolism are significant — meloxicam used in cattle has a very different dosing regimen than the same drug in cats, and many drugs toxic to cats are safe in dogs
A 2023 survey of UK farm vets found that analgesic use for routine painful procedures varied fivefold between practices, indicating inconsistent application of evidence-based pain management
Multi-modal analgesia — combining different drug classes targeting different pain pathways — is increasingly adopted as the gold standard for managing moderate to severe pain in animals

Welfare Considerations

The inconsistent application of evidence-based pain management across animal species and clinical contexts is one of the most significant systemic welfare problems in veterinary and agricultural medicine. An animal in pain who is not receiving appropriate analgesia is suffering unnecessarily, and this suffering is the direct consequence of human choices about whether to prescribe, purchase, and administer pain relief. The barriers are varied: cost, regulatory complexity for opioids, time pressure in agricultural contexts, and historical culture that underestimated animal pain. The welfare case for systematic pain management frameworks that match analgesic choice to pain severity, species, and procedure is strong and aligns with the professional obligations of veterinary practitioners. Closing the gap between best practice and average practice in veterinary pain management is a high-impact welfare priority.

What You Can Do

Ask your vet explicitly about pain management for any planned procedure for your animal — make clear that pain relief is a priority for you as an owner
Advocate for pain management guidelines to be mandatory components of veterinary professional standards and farm assurance scheme requirements
Support WSAVA (World Small Animal Veterinary Association) and IASP (International Association for the Study of Pain) initiatives developing animal pain ladder frameworks
Donate to the Animal Pain Consortium and similar organisations working on evidence-based pain management standards across animal species
Engage with agricultural training bodies to integrate pain recognition and analgesic use into farmer and stockperson education as standard welfare competencies
Support legislation requiring analgesic use documentation for all listed surgical procedures in all vertebrate species in both clinical and farm contexts
Raise awareness that animal pain management is not a luxury — it is a welfare requirement and a professional obligation in all contexts where animals undergo painful procedures