A woman once called me because her cat had "suddenly gone off his food for no reason." He was eating fine two weeks earlier. He was grooming himself. He was sleeping in his usual spot. Nothing about him looked wrong. It took about ten minutes of questions before we found it: he'd stopped jumping onto the windowsill, and instead of sitting there was pacing at floor level, checking the same corner over and over. That was the whole story. A cracked molar, as it turned out, found only because the vet went looking after I flagged it.
Dogs rarely make you work that hard.
1. The Behaviour Is Older Than Domestication
Cats didn't evolve as apex predators the way dogs' wolf ancestors did. A cat in the wild is both hunter and prey, small enough to be picked off by a hawk or a coyote if it looks weak. Limping, whimpering, or slowing down in front of others was a survival cost, not a request for help. So the animals that concealed injury lived longer, and that trait rode straight through thousands of generations into the cat sleeping on your sofa right now.
Dogs, by contrast, are pack animals. Signalling distress to the group had a payoff, because the pack might actually respond to it. A dog limping and whining is often doing exactly what its biology tells it to do. A cat doing the same thing has already overridden a very old instinct, which is usually a sign things have gotten bad.
This is the part owners find hardest to accept. It's not that your cat is being stoic or brave. It's not personality. It's wiring.
2. What Concealment Actually Looks Like Day To Day
Pain in cats rarely announces itself. It shows up as small subtractions — things the cat stops doing rather than new things it starts doing. A cat in pain might groom less around one hip, sit slightly differently, or go quiet in a household that's usually a bit chatty. None of that reads as "sick" to most people. It reads as "having an off day."
Here's a rough comparison of how the two species tend to signal the same underlying problem:
| Signal | Typical Dog | Typical Cat |
|---|---|---|
| Limping | Visible, often exaggerated | Often absent, weight shifts subtly instead |
| Vocalizing | Whines, yelps on contact | Usually silent, may flinch and pull away |
| Appetite | Drops quickly, obviously | Slight decrease, sometimes just slower eating |
| Activity | Reduced play, visible lethargy | Fewer jumps, shorter naps in new spots |
| Social behaviour | Seeks out owner more | Withdraws, hides, avoids handling |
And that's the pattern worth sitting with. A dog in pain tends to move toward people. A cat in pain tends to move away from them, which is exactly the opposite of what a worried owner expects to see.
3. Where Owners Usually Go Wrong
The most common mistake isn't ignoring pain. It's misreading it as something else entirely — moodiness, aging, a personality shift, a reaction to a new pet in the house. I've had clients tell me their cat "just got grumpy" over the space of a year, when what actually happened was slow-onset arthritis that made jumping and being picked up genuinely painful.
Litter box habits are another place this gets missed constantly. A cat that starts avoiding a box with high sides, or that seems to hesitate before squatting, isn't necessarily developing a behavioural quirk. That hesitation can be joint pain making the position uncomfortable. If you've already ruled out the usual litter box culprits, our piece on litter box changes that actually signal a health issue is worth a read before assuming it's just preference.
The other trap is treating "he's still eating" as proof nothing's wrong. Appetite is one of the last things to go. By the time a cat stops eating altogether, the problem has usually been present for a while. Watching the smaller signals — where he chooses to sit, how quickly he settles, whether he still bothers with his favorite window perch — tells you more, earlier.
4. What To Actually Watch For, And When To Call
None of this means treating every quiet afternoon as a medical emergency. Cats have off days same as anyone. But there's a real difference between a cat who's just being a cat and one whose body is quietly asking for help.
A few concrete things worth tracking:
- Sudden reluctance to jump to a height he used to clear easily
- Flinching or tensing when touched in a spot he used to tolerate — this is worth reading in more depth if it's new
- A change in how he grooms, especially patchy or uneven coat texture in one area
- Slower to settle, more time spent in unusual hiding spots rather than his normal favorites
- Any drop in appetite that lasts more than a day, even a small one
None of these individually means an emergency vet trip. Together, or persisting past a few days, they're a reason to go in. At Cat Wonder we tend to recommend erring early rather than waiting for something dramatic, because by the time a cat's pain becomes obvious to an untrained eye, it's usually been building for weeks. This matters even more with older cats, where twice-yearly checkups catch problems long before symptoms would otherwise show. If your cat is past seven or eight, that's a conversation worth having with your vet regardless of how fine he currently seems.
I'll admit I didn't fully appreciate this myself early in my career. I assumed a quiet, undemanding cat was simply a well-adjusted one. It took a few missed diagnoses, and a fair amount of guilt, to learn that quiet is sometimes the symptom.
A Few Questions I Get Asked Often
My cat still purrs even when I think he's in pain. Doesn't that mean he's fine? No. Purring isn't only a contentment signal. Cats also purr when stressed, frightened, or in pain, possibly because the frequency has a mild self-soothing or healing effect. Don't use purring alone to rule pain out.
How fast can pain-related behaviour change appear? It varies enormously depending on the cause. An acute injury can change behaviour within hours. Something like arthritis or dental disease develops slowly, over weeks or months, which is exactly why it gets missed.
Is it true that black cats or certain breeds hide pain even better than others? There isn't strong evidence for coat colour making a difference. Breed and individual temperament matter more. Naturally more independent or reserved cats tend to mask discomfort further, simply because they were already giving off fewer signals to begin with.
Should I just watch and wait if I'm not sure? A day or two of closer observation is reasonable. Past that, or if appetite drops alongside any physical change, it's worth a vet visit rather than more waiting. Vets would rather rule pain out than have an owner wait too long.
Can pain medication mask these signs and make things confusing? Yes, and this comes up more than people expect, especially with cats already on medication for something else. Always tell your vet about any current medication before they assess new symptoms, since it can blunt the very signals you're trying to read.
If you want a fuller list of exactly which behaviours tend to signal hidden pain in cats, Cat Wonder has a dedicated breakdown here that goes into more detail than I have room for above.
