Animals have evolved to hide pain — showing vulnerability in the wild makes them targets for predators. This survival instinct means our pets often suffer silently. Learning to read the subtle signs can help you catch problems early.
Why Pets Hide Pain
In the wild, showing weakness attracts predators and risks losing social status. Domestic dogs and cats retain this instinct, meaning they can be in significant pain before showing obvious signs. Cats are particularly stoic — a 2019 study in Scientific Reports developed the Feline Grimace Scale specifically because cats' pain signs are so subtle that even veterinarians frequently miss them.
Signs in Dogs
Changes in appetite or drinking habits, reluctance to climb stairs or jump, limping or favoring a limb, excessive panting when not hot or exercised, changes in sleep patterns (sleeping more or restless), and decreased interest in play or walks are common pain indicators. More subtle signs include pacing, trembling, seeking more affection than usual (or conversely, withdrawing), excessive licking of a specific body part, and changes in posture (hunched back or tucked abdomen).
Signs in Cats
Cats tend to withdraw when in pain — hiding in unusual places, reducing grooming (leading to a scruffy coat), or conversely over-grooming a painful area. Changes in litter box habits, decreased appetite, sitting hunched with eyes partially closed, avoiding being touched in specific areas, and reduced jumping are all potential pain indicators. The Feline Grimace Scale evaluates five facial action units: ear position, orbital tightening, muzzle tension, whisker change, and head position.
Behavioral Changes Are Key
The most reliable indicator of pain in any pet is a change from their normal behavior. You know your pet better than anyone — if something seems "off," trust your instinct. The American Animal Hospital Association (AAHA) published pain management guidelines emphasizing that any behavioral change in a pet should prompt consideration of pain as a cause.
Common Painful Conditions by Age
Young pets: growing pains (panosteitis), retained baby teeth, intestinal parasites. Adult pets: dental disease, ear infections, skin allergies, injuries. Senior pets: osteoarthritis (affecting up to 80% of dogs over 8 and 90% of cats over 12), cancer, and spinal issues. Regular veterinary checkups — at least annually for adults and twice yearly for seniors — are crucial for catching these conditions early.
What to Do
Never give human pain medications to pets — ibuprofen, acetaminophen, and aspirin can all be toxic to dogs and cats, potentially causing kidney failure, liver damage, or gastric ulcers. If you suspect your pet is in pain, schedule a veterinary visit promptly. Note specific behaviors, when they started, and what seems to make them better or worse.