Dog Pain Assessment: Recognizing Suffering in Companion Dogs

Accurate pain assessment in dogs is critical to welfare but challenging because dogs mask pain. Validated assessment tools and behavioral knowledge enable owners and veterinarians to identify and treat canine pain effectively.

Key Facts

Dogs mask pain as a survival instinct — a dog who appears comfortable may still be experiencing significant chronic pain
The Glasgow Composite Measure Pain Scale and Colorado State University Pain Scale are validated acute pain assessment tools
Chronic pain assessment in dogs uses tools including the Helsinki Chronic Pain Index and Canine Brief Pain Inventory
Dogs in pain often show behavioral changes including reduced activity, reluctance to engage, changes in posture, and altered facial expression
The Canine Pain Grimace Scale, developed from facial action coding, is emerging as a practical chronic pain indicator
Osteoarthritis pain in dogs is often undertreated — owners attribute reduced activity to "slowing down with age" rather than pain
Multimodal pain management combining NSAIDs, gabapentin, environmental modification, and physiotherapy gives optimal outcomes

Welfare Considerations

Canine pain assessment represents both a welfare opportunity and a welfare gap. The opportunity: validated assessment tools now exist that, when properly used, can reliably identify chronic pain in dogs who show no obvious lameness. The gap: most dog owners and many veterinarians are not using these tools, and chronic pain in dogs — from osteoarthritis, dental disease, neuropathy, and other conditions — remains dramatically undertreated. The welfare implications are significant: millions of dogs are living with chronic pain that is both recognizable and treatable. Education of owners to recognize subtle pain indicators — reluctance to use stairs, changes in greeting behavior, reduced play engagement, altered sleeping positions — is a high-leverage welfare intervention that costs nothing beyond awareness.

What You Can Do

Familiarize yourself with the behavioral signs of chronic pain in dogs, which differ from acute pain indicators
Ask your veterinarian to conduct a structured pain assessment at every annual examination for dogs over age 7
Use validated owner-completed pain questionnaires like the Canine Brief Pain Inventory to track your dog's comfort over time
Do not attribute reduced activity or behavioral changes in older dogs to normal aging without ruling out treatable pain
Discuss multimodal pain management options with your veterinarian rather than accepting that nothing can be done
Advocate for pain assessment training as a standard component of veterinary education programs