Feline Grimace Scale: Score Cat Pain in 30 Seconds

Pain in a cat is scored, not sensed. The Feline Grimace Scale (FGS) rates 5 facial units from 0 to 2 each, for a total of 0 to 10, and a score of 4 or more is the line where analgesic treatment is indicated. Score it in 30 seconds from 1 meter away, treat at 4 and above, then re-score every 30 minutes until the number falls under 4 and stays there. That loop - score, treat, re-score on a clock - is what separates pain management from guessing.

Why a face works as a pain meter

An injured cat does not limp dramatically or cry. It freezes. The muscles that pull the ears back, narrow the eye opening, and flatten the whiskers are under involuntary control, so they leak information the cat is trying to hide. The FGS was built around that idea: 5 units, each with 3 anchor descriptions, chosen because 2 trained observers could agree on them. It works from a photo and it works on a phone video, which matters because a cat in an emergency room is not going to cooperate with a 10-minute exam.

The 5 units, scored 0 to 2

Unit	0 points	1 point	2 points
Ear position	Ears facing forward	Ears slightly flattened	Ears rotated outward, flat to the head
Orbital tightening	Eyes fully open	Eyelids partly narrowed	Eyes squeezed to a slit
Muzzle tension	Relaxed, round	Mildly tense	Tense and drawn back
Whisker position	Loose, curved, forward	Slightly clustered	Straight, bunched, pointing back
Head position	Level with the shoulders	Slightly lowered	Held below the shoulder line

Sum the 5 numbers. A cat that scores 1 on all 5 units totals 5 and needs treatment, which is the practical point: mild changes across every unit matter more than 1 dramatic unit. Score what you see in the first 3 seconds, before the cat notices you, and do not average with a score taken while it was being restrained.

Scoring without wrecking the score

Four conditions make the number usable. Light from the front, not overhead, because a shadow over the eyes reads as orbital tightening. Distance of 1 to 1.5 m, at the cat's eye level. No talking and no door slamming: a startled cat scores 1 to 2 points higher on ears and eyes for 60 to 90 seconds. Thirty seconds of observation, filmed if you can, because a still photo catches 1 frame and a 10-second clip catches the ear flick that a photo misses.

Score before analgesia, not after. If the cat was given an opioid 15 minutes ago, the true score is the one from before the injection; re-scoring at 30 minutes measures the drug, not the pain.

Reading the total: 3 bands

• 0 to 3: not painful by this instrument. Keep monitoring every 2 to 4 hours; a cat that stays at 3 for 6 hours is drifting, not stable.
• 4 to 6: treat. Most protocols give an opioid first, then reassess at 30 minutes; expect a drop of 2 points or more if the drug is working.
• 7 to 10: severe. Treat now, recheck at 15 to 30 minutes, and start asking what is not being controlled - a fracture, a blocked bladder, pancreatitis, or a wound that needs surgery rather than another dose.

Posture and activity carry the other half

Faces score pain; bodies score suffering. A cat in pain sits in a crouch with all 4 feet gathered under the body and the head hung lower than the shoulders. It stops grooming, stops jumping to a 60 cm shelf it used daily, and hides in a 30 cm gap behind furniture. It may eat nothing for 24 hours and drink nothing for 12. Log 3 things at home: the highest surface it jumped onto in the last 24 hours, the percentage of its normal food eaten, and whether it walked to the litter box or was carried.

The 30-minute log

One sheet, 5 columns, filled by whoever is in the room. Time, FGS total, heart rate, respiratory rate, and what was done. The numbers below are a realistic sequence after a 6 at triage.

Time	FGS total	Heart rate (bpm)	Resp rate (/min)	Action
14:00	6	220	44	Score recorded, opioid given
14:30	4	200	36	Still at threshold, reassess at 15 min
15:00	2	184	30	Comfortable, continue q2h checks
16:00	5	210	40	Drug wearing off, second dose due

Normal awake values for context: heart rate 140 to 220 bpm, respiratory rate 20 to 30 per minute, systolic blood pressure 110 to 160 mmHg. A cat whose FGS falls but whose heart rate stays above 220 is not comfortable, whatever the face says. If the injury followed a lily, an antidepressant, or a spot-on flea product, run the name through the toxin list before anything else.

What inflates the score

Fear is the biggest confounder: an unhandled cat in a strange room will flatten its ears and squint with no pain at all, which can add 2 to 3 points. Breathing difficulty tightens the muzzle. Nausea lowers the head. Sedation drops the ears and closes the eyes, producing a false 6 in a cat that is actually resting. Cold, a full bladder, and a bandaged limb also shift posture. Score the cat twice, 5 minutes apart, in the same position, and treat the higher number only if the second score confirms it.

When the number is not the whole answer

Some presentations need treatment before anyone scores: open-mouth breathing, a bladder that will not express, a limb hanging at an impossible angle, blood from the mouth, or a cat that has not urinated in 24 hours. Neurological pain and abdominal pain score poorly on a facial scale, so a cat with a normal face and a rigid abdomen still needs imaging. A cat that turns aggressive when you touch one hip is drawing a pain map, not changing personality. Cost is part of the conversation too - ask for the estimate in writing before the first opioid, because emergency bills are built from 4 or 5 line items, not 1.

What to do tonight: film 10 seconds of the cat from 1 m without calling it, score the 5 units, write the total with the time, and take the same measurement every 30 minutes if the cat is unwell. Bring the paper to the visit. A vet who receives 5 timed scores and 1 video starts 2 steps ahead of a vet who receives the sentence that the cat seems off.

Terms mentioned in this article

FGS

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