Cats mask pain exceptionally well. The Feline Grimace Scale provides a validated tool for detecting and quantifying pain in cats based on facial action units.
Cats in chronic pain from conditions including arthritis, dental disease and cancer show persistent facial changes that owners and veterinarians frequently miss. The Feline Grimace Scale provides a systematic observation framework that removes the subjectivity from pain assessment. Validated in acute and post-operative pain settings, the scale is increasingly applied to chronic pain monitoring. Regular FGS assessment at wellness visits allows trend monitoring that identifies developing or worsening pain. Owners trained to use simplified versions of the scale at home provide valuable longitudinal data between appointments.