Cat Grimace Scale
A simple web tool for comparing your cat's facial expression against the five features used in the Feline Grimace Scale.
What Is the Cat Grimace Scale?
The Cat Grimace Scale, also known as the Feline Grimace Scale, is a structured observation tool based on published research into how cats' facial expressions change when they are in pain. It focuses on five facial action units: ear position, orbital tightening, muzzle tension, whisker position, and head position. Rather than asking an owner to decide whether a cat looks painful in a general sense, the scale breaks the face into five parts and asks for a simple 0, 1, or 2 judgement for each.
Cats are famously good at hiding discomfort, and the signs can be subtle. Ears that sit a little lower, eyes that look slightly narrower, or whiskers that point forward instead of curving outward can all be meaningful when they appear together. The scale exists because those individual changes are easy to overlook, while a structured comparison makes them easier to notice.
The strength of the scale comes from combining observations. A single flattened ear is not evidence of pain by itself, and a cat squinting in bright sunlight is not the same as a cat showing orbital tightening in a calm room. When all five features are considered together, the overall pattern is more informative than any one feature on its own.
The scale is an assessment aid rather than a diagnostic test. It does not measure pain directly, it does not identify a disease, and it cannot replace a veterinary examination. Its value is to give owners a calmer, more consistent way to look at their cat and to decide whether the next step should be a conversation with a veterinarian.
Work through the five facial features step by step with the reference illustrations. The tool keeps your photo in your browser, lets you mark features you cannot see, and explains the result at the end.
Start assessmentHow the Cat Grimace Scale Works
The Cat Grimace Scale turns a difficult question into five smaller, more manageable comparisons. For each facial feature, the owner compares the cat with three reference states: absent, moderately present, and markedly present. These states are scored 0, 1, and 2. When all five features are scored, the values are added to produce a total from 0 to 10.
The order of observation matters less than consistency. Most people find it easiest to start with the ears, move to the eyes, then the muzzle, whiskers, and head position. Looking at one feature at a time reduces the tendency to jump to a general impression such as "the cat looks unhappy" and instead produces a specific, repeatable set of observations.
Published owner guidance often treats a total of 4 or higher as a prompt to contact a veterinarian, but that number is guidance, not a medical boundary. A cat with a low score can still be unwell, and a cat with a higher score is not automatically diagnosed with anything. The score is most useful when it is combined with everything else the owner already knows about the cat's normal behaviour.
- Choose a clear photo — use a well-lit, front-facing image where the eyes, ears, and muzzle are visible.
- Observe one feature at a time — work through ears, eyes, muzzle, whiskers, and head position in turn.
- Compare each feature with the reference images — decide whether the sign is absent, moderately present, or markedly present.
- Review the individual scores — note which features changed rather than only the total.
- Consider the overall context — stress, sleep, lighting, and the cat's normal face all affect the reading.
Look at one feature
Focus only on the named feature, such as ear position, before moving to the next one.
Compare with references
Match the cat against the absent, moderate, and marked examples for that feature.
Score or skip
Choose 0, 1, or 2. If the feature is hidden, mark it as not visible instead of guessing.
The Five Facial Features
Each feature is scored separately, then the observations are combined.
Ear position
Ear position is one of the most visible parts of the scale. A relaxed cat usually holds both ears forward or gently to the side. When a cat is uncomfortable, the ears may rotate outward, sit lower, or flatten against the head. The key is to look at both ears together and compare them with the reference illustrations. A single flattened ear, for example, may mean a cat is listening to something behind it rather than signalling pain. That is why ear position is never interpreted on its own.
Orbital tightening
Orbital tightening describes how open or narrowed the eyes appear. A comfortable, alert cat tends to have open eyes with a rounded shape. With pain or discomfort, the eyes can look partially closed, narrowed, or squinted even when the cat is awake. This is easy to confuse with sleepiness, bright light, or a slow blink, so the surrounding context matters. The scale asks you to judge the eye opening itself, not the cat's mood, and to compare it with the published reference images.
Muzzle tension
Muzzle tension refers to the shape and visible tightness of the muzzle and whisker pads. A relaxed muzzle looks full and gently rounded. When a cat is tense, the same area can look flatter, more oval, or more drawn. This is often one of the more subtle features to judge, especially on long-haired cats. Comparing the outline of the muzzle with the reference illustrations helps, but if the muzzle is hidden or too unclear to see, the scale allows you to mark it as not visible instead of guessing.
Whisker position
Whisker position changes with alertness, mood, and discomfort. Relaxed whiskers tend to curve outward to the sides. With tension or pain, whiskers may straighten and point more directly forward. Cats also vary a great deal in natural whisker shape and length, so this feature is always compared against the rest of the face rather than judged in isolation. A clear, well-lit photo from the front makes whisker position easier to read than a dark or angled shot.
Head position
Head position compares the cat's head with the shoulder line. A cat that feels comfortable often holds its head above the shoulders. A lowered head can accompany pain, nausea, or withdrawal, but it can also simply mean the cat is resting or looking at something low. Because posture is influenced by many things, head position is only one observation among five. The scale treats it as a supporting sign rather than a standalone conclusion.
| Feature | What to observe | Why it matters | Common limitations |
|---|---|---|---|
| Ear position | Forward, rotated outward, or flattened | Ear changes are often visible early | Ears also move to track sound |
| Orbital tightening | Open, partially closed, or squinted | Eye narrowing can accompany pain | Also caused by light and sleepiness |
| Muzzle tension | Rounded, tense, or drawn | Changes can indicate facial tension | Hard to see on long-haired cats |
| Whisker position | Curved sideways or straight forward | Whiskers shift with arousal | Varies naturally between cats |
| Head position | Above, level, or below shoulders | A low head can accompany discomfort | Also changes with rest and posture |
How to Interpret Cat Grimace Scale Scores
The total score places the cat on a simple scale from 0 to 10. A low total means the five facial features looked relaxed and open at the moment of observation. A higher total means more of the features appeared tense, narrowed, flattened, or lowered. That is the full extent of what the number measures. It is not a pain level in the way a thermometer measures temperature, and it should not be read to one decimal point.
The pattern across features matters as much as the total. Five features scored 1 produce the same total as one feature scored 2, three scored 1, and one scored 0, but the two cats may look very different. A single clearly changed feature can still be worth noticing, especially if it is unusual for that cat. The scale encourages owners to keep the individual scores visible rather than remembering only the total.
Photo quality and angle have a large effect on interpretation. A blurry photo, a side view, or a dark image can make the eyes look narrowed or the muzzle look tense when neither is actually changed. If a feature cannot be assessed clearly, marking it as not visible is more honest than forcing a score. The result should be treated as a prompt for further observation or veterinary advice, never as a confirmed measurement of pain.
- A total below 4 suggests few of the five features were scored as clearly changed in that image.
- A total of 4 or higher matches the owner-facing cutoff described on the official Feline Grimace Scale website.
- A low score does not rule out pain, and a high score is not a diagnosis.
- The individual feature scores are more informative than the total alone.
What Can Affect a Cat's Facial Expression?
Facial expression is only one part of a cat's overall state, and many everyday situations change it. Stress and fear commonly flatten the ears, widen or narrow the eyes, and shift the whiskers. A cat at the veterinary clinic, in a carrier, or near an unfamiliar animal may show a tense face for reasons that have nothing to do with illness. Sleep also changes the face: a relaxed, half-asleep cat can show narrowed eyes and lowered ears simply because it is resting.
Posture and environment influence the reading too. A cat crouched low to watch prey or a sound may hold its head below the shoulder line without being painful. Bright light can cause squinting, and a cold room can make a cat curl tightly. These factors do not make the scale useless; they mean the face should be read in context and compared with what is normal for the individual cat.
Camera angle and lighting are practical sources of error. A photo taken from above can make the eyes look narrower, a dim photo can hide the muzzle outline, and a blurry image can exaggerate tension. Individual differences matter as well: some cats naturally have flatter muzzles, more forward whiskers, or ears that sit lower. When in doubt, treat the image-based result as limited information and look at the whole cat before drawing conclusions.
Contact a veterinarian if you are concerned about your cat's comfort, behaviour, or health. Signs such as a changed appetite, reduced grooming, hiding, reluctance to move, altered litter box habits, or a facial expression that seems tense are all reasons to ask for professional advice. A low score on this tool does not rule out a problem, and no website observation can replace a hands-on examination. If a cat seems to be in pain, worsens quickly, or stops eating, seek veterinary care promptly. Never give a cat human medication or medication intended for another animal unless a veterinarian has directed it.
- Changed appetite, drinking, or litter box habits
- Hiding, irritability, or reduced interaction
- Less grooming or a dull, unkempt coat
- Hesitation to jump, climb, or move around
- A facial expression that seems tense, narrowed, or flattened
Common questions
What is the Cat Grimace Scale?
The Cat Grimace Scale, also called the Feline Grimace Scale, is a structured way to look for facial changes that can accompany acute pain in cats. It uses five facial action units: ear position, orbital tightening, muzzle tension, whisker position, and head position. Each feature is scored 0, 1, or 2 by comparing the cat with reference images. The result is a total from 0 to 10. It is an observation tool, not a medical test.
Is the Cat Grimace Scale a diagnosis?
No. The scale is an educational assessment aid. It helps owners make a more structured observation of their cat's face, but it cannot diagnose pain, illness, or any specific condition. Many things other than pain can change a cat's facial expression, including stress, fear, sleepiness, and lighting. A veterinarian should always be consulted for concerns about a cat's health.
How is the score calculated?
Each of the five facial features is scored 0 for absent, 1 for moderately present, or 2 for markedly present. The five scores are added together to make a total from 0 to 10. If a feature cannot be seen clearly, it can be left unscored. An incomplete score should be treated as partial information rather than a standard total, because published guidance assumes all five features have been assessed.
What score suggests I should contact a veterinarian?
Published owner-facing guidance for the Feline Grimace Scale commonly uses a total of 4 or higher as a prompt to contact a veterinarian. However, this threshold is guidance, not a diagnosis. A lower score does not prove a cat is comfortable, and a higher score does not prove a specific illness. Any change in behaviour, appetite, mobility, or routine is a valid reason to seek veterinary advice on its own.
Do I need to score all five features?
Scoring all five features gives the most useful result because the scale is designed around the overall facial pattern. If one feature is hidden or unclear, you can mark it as not visible and continue. The result is then partial. It can still help you notice something worth discussing with a vet, but it should not be compared directly with a complete 0 to 10 total.
Can I use the tool without uploading a photo?
Yes. The tool has a skip option that lets you move through the five comparisons without a photo. Without a photo you will need to remember what your cat's face looked like, so the result may be less reliable than working directly from a clear image. If you do use a photo, it stays in your browser and is not uploaded to a server.
Can stress change my cat's facial expression?
Yes. Stress, fear, unfamiliar environments, and handling can all change ear position, eye shape, whisker position, and posture. A cat at the veterinary clinic may show a very different facial expression than the same cat at home. The scale works best when the photo shows the cat in a settled, familiar setting, and when the result is combined with what you know about the cat's normal behaviour.
Does a low score mean my cat is fine?
Not necessarily. The scale only looks at the face and only at one moment in time. A cat can be unwell and still score low, especially if the photo is blurry, taken from a poor angle, or captured while the cat is resting. Trust your wider knowledge of the cat. If its behaviour, appetite, litter box habits, or movement have changed, contact a veterinarian even when the score is low.
Sources and further reading
- Feline Grimace Scale official website — felinegrimacescale.com
- Evangelista MC, et al. Facial expressions of pain in cats: the development and validation of a Feline Grimace Scale. Scientific Reports. 2019. DOI 10.1038/s41598-019-55693-8
This site uses the five facial action units and the 0 to 10 scoring structure described in the published Feline Grimace Scale literature. The reference illustrations are provided for visual comparison and education.