Cat Pain Recognition Using Facial Coding

The feline grimace scale enables owners and vets to reliably assess pain in cats from facial expressions, improving detection and treatment of suffering in this stoic species.

Key Facts

The Feline Grimace Scale (FGS) was validated in 2019 and uses five facial action units.
Action units include orbital tightening, muzzle tension, whisker position, ear position, and head position.
The FGS can be applied from photographs, enabling remote pain assessment.
Cats with acute pain score significantly higher on the FGS than pain-free cats.
The scale is now recommended by veterinary pain management organisations globally.

Welfare Considerations

Cats are notoriously stoic and frequently suffer in silence from acute and chronic pain. The Feline Grimace Scale provides an objective, validated tool that enables any observer — including owners — to assess pain from facial expression alone. This democratises pain recognition beyond the specialist veterinary context and enables earlier intervention. Training owners to use the FGS during recovery from illness, injury, or surgery significantly improves post-procedural pain management and reduces unnecessary suffering at home.

What You Can Do

Learn the Feline Grimace Scale and use it to assess your cat after any injury or procedure.
Share the FGS resource with fellow cat owners to improve community-wide pain recognition.
Ask your vet to teach you how to apply the FGS before your cat is discharged after surgery.
Photograph your cat during recovery to compare facial expressions across days for trend assessment.
Contact your vet promptly if your cat scores 4 or higher on the Feline Grimace Scale.