Why Pets Don't Tell You When They Hurt
In the wild, showing weakness invites danger. That evolutionary instinct hasn't left our domestic dogs and cats — even comfortable house pets tend to mask discomfort until it becomes significant. This makes pain one of the most underrecognized health challenges in companion animals.
As a pet owner, your most powerful tool is knowing your animal's baseline behavior. Subtle departures from that normal pattern — changes in how they eat, move, interact, or groom — are often the earliest clues that something is wrong. The signs below span dogs and cats and represent some of the most clinically recognized indicators of pain. This article is for general educational purposes only and is not a substitute for veterinary advice. Always consult a licensed veterinarian if you have concerns about your pet's health.
For related context on how pets mask discomfort, see our article on why animals hide pain.
Changes in appetite or water intake
A pet that suddenly eats less, skips meals, or drinks noticeably more or less water than usual may be experiencing discomfort. Pain in the mouth, abdomen, or joints can all suppress appetite. While appetite changes also accompany illness and stress, they remain one of the first measurable signs owners can track. Keep a loose log of your pet's eating habits so you have a reliable baseline to reference.
Skipping meals or drinking less water can be among the earliest measurable signs of pain.
Reduced activity or reluctance to move
If a dog that normally rushes to the door now hangs back, or a cat that loved jumping to high perches avoids doing so, pain is a plausible explanation. Musculoskeletal pain — including arthritis — commonly presents as stiffness, slowness getting up, hesitance on stairs, or a shortened stride. These signs are easy to attribute to aging, but gradual mobility decline still warrants a veterinary conversation, not acceptance.
Reluctance to climb, jump, or rise from rest is a common sign of musculoskeletal pain in pets.
Altered grooming behavior
Both over-grooming and under-grooming can signal pain. Cats in pain may lick or chew obsessively at a specific area of their body — a response to localized discomfort. Conversely, a pet that stops grooming altogether or develops a dull, unkempt coat may simply lack the energy or mobility to maintain their routine. Our article on subtle behavioral shifts in cats covers grooming changes in more detail.
Obsessive licking of one spot or a sudden drop in grooming both warrant a closer look.
Increased vocalization or unusual silence
Whimpering, whining, growling when touched, or yowling in the night are clearer pain signals. But the opposite can be equally telling — a normally vocal cat or dog that goes quiet and withdrawn may be suppressing signs of distress. Pay attention to vocalizations that occur during specific movements (like lying down or being lifted) as these often point to location-specific pain.
Vocalization during movement or handling often points to pain at a specific location in the body.
Postural or facial changes
A hunched back, tucked abdomen, lowered head carriage, or splayed stance can indicate pain. In the face, look for squinting, partially closed eyes, a furrowed brow, or ears pinned back — these are recognized pain indicators in both dogs and cats. Veterinary researchers have developed formal facial action coding tools for animals precisely because facial expression is a reliable pain signal. For more on reading cat body language, see our cat body language guide.
Squinting, a furrowed brow, or a hunched posture are recognized physical indicators of animal pain.
Aggression or withdrawal when touched
A normally affectionate pet that flinches, growls, snaps, or retreats when handled in a specific area is communicating discomfort. This is one of the most direct signals available and should be respected rather than corrected. Don't assume your pet is being difficult — assess whether the response is tied to a particular region of the body, then report it to your vet with as much detail as possible about where and when the reaction occurs.
Sudden aggression when touched is often a pain response, not a behavioral problem.
Sleep and rest pattern disruptions
Pain often worsens at night or during extended rest, particularly with joint-related conditions. If your pet is restless, repeatedly repositioning, unable to settle, or waking more frequently, discomfort may be interfering with their ability to rest. Conversely, a pet sleeping far more than usual and disengaging from normal activities may be fatigued from managing ongoing pain. Changes in where they choose to sleep — avoiding their usual spot — can also be meaningful.
Restlessness at night or excessive sleep and withdrawal may both reflect unmanaged chronic pain.
When to Act — and How Quickly
Not every pain signal is an emergency, but none should be dismissed. If your pet is showing a single, mild sign, monitor closely and contact your veterinarian within 24–48 hours. If multiple signs appear together, behavior changes suddenly, or your pet shows signs of severe distress — labored breathing, inability to stand, crying out unprovoked — treat it as urgent and seek same-day veterinary attention.
Document What You Observe Before Calling
When you notice a pain signal, jot down what you saw, when it happened, how long it lasted, and whether any specific trigger preceded it. Video on your phone can be invaluable — many symptoms disappear in the exam room. Arriving at your vet appointment with detailed observations helps your veterinarian make a faster, more accurate assessment.
Older animals are especially vulnerable. As pets age, chronic conditions like arthritis become more common and harder to detect because the onset is gradual. Our guide on caring for a senior pet covers what to expect and watch for as your animal ages.
It's also worth noting that some pain signals look similar to stress or anxiety responses. Our resource on pet stress signals can help you distinguish between the two. And when in doubt about whether a vet visit should wait, consider reading about the cost of delayed veterinary care — both medically and financially.
This article is for informational purposes only and does not constitute veterinary medical advice. Always consult a licensed veterinarian for guidance specific to your pet's health and condition.
