That instinct doesn't switch off because your dog sleeps on a Tempur-Pedic bed and eats better than most people do. A dog in pain can still wag their tail when you walk in the door, chase their favorite toy, and finish a walk. Those behaviors prove your dog is trying, not that your dog is pain free.
Why do dogs hide their pain?
Dogs hide pain because, for most of their history, looking weak was dangerous. An animal that limps or whimpers stands out to predators and rivals. So hiding discomfort became a survival advantage, and every dog still carries that, no matter the breed or how pampered their life is [1].
It helps to know two terms: nociception and pain. Nociception is the body's alarm system. Nerves detect something harmful, like pressure, heat, or swelling, and send a signal to the brain. The wiring is largely the same in dogs as in people.
Pain is what happens next. It's the unpleasant feeling, both physical and emotional, that the brain builds from that signal [2]. Nociception is the alarm going off. Pain is the experience of hearing it.
The International Association for the Study of Pain, the leading scientific group on pain, is clear on one point. An animal's inability to say “it hurts” doesn't mean it isn't in pain or doesn't need relief [2]. The Merck Veterinary Manual adds that even trained observers struggle to tell which animals are in pain, and how much [3]. A quiet dog is not automatically a comfortable one.
How do I know if my dog is in pain?
A single behavior rarely proves pain on its own. But a cluster of small changes, especially new ones, deserves your attention. Watch for these silent signs:
- Morning stiffness that eases as the day goes on.
- Slow or careful getting up after a nap.
- Skipping things your dog used to do easily, like using the stairs, accessing the couch, or getting in the car.
- Shorter or slower walks for no clear reason.
- Panting while resting, with no heat or exercise to explain it [1].
- Snapping, flinching, or pulling away when touched in one spot. That's usually a dog protecting a sore area, not bad behavior [4].
- Acting clingy, withdrawn, or restless in a way that's new [5].
- Sleep changes, like shifting positions over and over at night.
One of these on its own may mean little. Several together, especially when they're new for your dog, are worth a closer look.
How do I know what's normal for my dog?
Compare your dog to your dog, not to other dogs. Maybe you heard someone say “Labradors slow down around ten,” but breed averages can be misleading. A Greyhound and a Chihuahua don't move, breathe, or rest the same way. Even dogs of the same breed vary. Research has found that sensitivity to pain can differ by breed [6].
What catches pain early is your dog's individualized baseline, a picture of normal as unique as your dog: how they get up in the morning, how far they usually walk, how they sit, and how they sleep when they feel well. Pain shows up as a slow drift away from that baseline. Often it's so gradual that dogs adjust without their owners noticing. A walk that shrinks by ten minutes over three months doesn't feel urgent, because your dog is still walking. So the right question is never “Is this normal for a dog?” It's “Is this normal for my dog?”
Wondering whether a slowdown is age or pain? We cover that in “Is My Dog Just Getting Old, or Is This Pain?”
What do morning stiffness, a splayed sit, a head bob, or panting at rest mean?
These are four signs I get asked about often, and each one means something specific.
Morning stiffness that loosens up after a few minutes is a hallmark of arthritis. The joints stiffen at rest and move better once warmed up. That's exactly why it's easy to write off as “just slow to get going” or “getting older.”
A splayed sit means one or both back legs are kicked out to the side instead of tucked tightly underneath. Dogs sit this way to take weight off a sore hip, knee, or lower back. It's often mistaken for a cute quirk instead of a clue for pain.
A head bob while trotting usually points to a sore front leg. The head lifts when the sore leg hits the ground and drops when the good leg lands, because the dog is shifting weight off the painful limb. It's subtle at a walk but easy to catch with close observation.
Panting at rest, with no heat, exercise, or excitement to explain it, is a recognized sign of pain and stress [1]. It isn't just a warm afternoon.
Film these moments at home, especially first thing in the morning before your dog has warmed up. A short video shows your vet what a ten-minute exam usually can't.
When should I take my dog to the vet for pain?
It's hard to know when a change means wait and watch, call your vet, or drop everything and go. Here's how I'd sort it:
- Wait and watch: one mild sign that doesn't repeat, like one slow morning or one shorter walk.
- Call your vet tomorrow: a sign that keeps happening, or two signs of pain together, like new stiffness plus restless nights.
- Go now: your dog can't put weight on a leg, collapses, cries out, has a swollen belly, struggles to breathe, or suddenly turns weak or wobbly.
Going straight to the vet in those moments isn't overreacting. It's good advocacy.
I won't tell you what medicine to give your dog. That belongs with your vet, who can examine them and knows their history. What I can tell you is that the pattern matters more than any single moment, and you're in the best position to see it. You know what is your dog's normal.
Can a device tell if my dog is in pain?
A device can't diagnose pain, but it can catch the pattern you can't watch around the clock and predict is pain is present. To ease the stress of those decisions, we built The Ruff, Tether's collar-mounted monitor. It tracks your dog's movement, heart and breathing rate, temperature, vocalizations, and tiny muscle tremors. Then it compares those readings to your dog's own individualized baseline, not a population average, so the pattern you'd miss at 3 a.m. still gets caught. It doesn't replace your vet. It helps you give your vet weeks of your dog's real-life trends instead of a brief snapshot.
“Every clinical claim The Ruff makes crosses my desk before it reaches you. I hold it to the standard I'd want for my own dogs, because that's exactly what yours deserve.”
Animals speak to those who listen.
Dr. Zachary L. Pollack, DVM, MRCVS
- Walsh S. Understanding the link between canine pain and problem behaviours. Veterinary Ireland Journal. February 2025.
- International Association for the Study of Pain Task Force on Taxonomy. In: Merskey H, Bogduk N, eds. Classification of Pain. 2nd ed. Seattle: IASP Press; 1994:209-214.
- Merck Veterinary Manual. Recognition and Assessment of Pain in Animals. Reviewed/Revised March 2023.
- Barcelos A-M, Mills DS, Zulch H. Clinical indicators of occult musculoskeletal pain in aggressive dogs. Veterinary Record. 2015;176(18):465. doi:10.1136/vr.102830.
- Mills DS, Demontigny-Bedard I, Gruen M, et al. Pain and Problem Behavior in Cats and Dogs. Animals (Basel). 2020;10(2):318. doi:10.3390/ani10020318.
- Caddiell RM, et al. Pain sensitivity differs between dog breeds but not in the way veterinarians believe. Frontiers in Pain Research. 2023;4:1165340.