Signs Your Pet May Be in Pain — and What to Do Next

Why Pets Hide Pain — and Why That Matters

Domestic dogs and cats share an instinct inherited from their wild ancestors: masking vulnerability. An animal that visibly suffers is an easier target for predators, so many pets suppress obvious pain signals until discomfort becomes severe. This means the cues owners actually see are often subtle, behavioral, and easy to attribute to something else — a bad mood, aging, or stress.

Understanding this masking tendency is the foundation of good pet health observation. Pain in animals doesn't always look like pain. It can look like withdrawal, appetite changes, or unusual aggression. The earlier a problem is detected, the more treatment options are typically available. See our life-stage health overview for how pain recognition needs shift as your pet ages.

Behavioral and Physical Signs to Watch For

Pain in pets tends to manifest across two broad categories: changes in behavior and observable physical signs. Neither category alone is diagnostic, but together they build a picture worth discussing with your veterinarian.

Behavioral Changes

• Withdrawal or hiding: A sociable pet who suddenly retreats and avoids interaction may be self-protecting.
• Increased vocalization: Whimpering, growling, or excessive meowing — especially when touched or moved — can signal discomfort.
• Irritability or aggression: A pet that snaps or hisses when approached in ways they previously tolerated may be guarding a painful area.
• Reduced activity or reluctance to move: Skipping a favorite game, hesitating on stairs, or stiffness after rest can suggest musculoskeletal pain.
• Changes in appetite or water intake: Both increases and decreases may signal underlying issues, including oral pain. This is explored further in our article on frequently missed dental disease.
• Sleep disturbances: Restlessness, difficulty settling, or unusual sleeping positions may indicate the pet can't find a comfortable posture.

Physical Signs

• Postural changes: A hunched back, tucked abdomen, or consistently lowered head can suggest internal or musculoskeletal discomfort.
• Altered gait: Limping, favoring one leg, or an uneven gait warrants prompt attention.
• Excessive licking or chewing: Pets often focus on a painful spot. Over-grooming can signal either stress or pain — or both.
• Changes in facial expression: Squinting, half-closed eyes, or flattened ears in cats and dogs are recognized pain indicators in veterinary practice.
• Rapid or shallow breathing at rest: When not exercising, labored breathing can be a sign of significant pain or an underlying health concern.

What to Do When You Suspect Pain

If you notice two or more of the signs above — or any single sign that is sudden and severe — the appropriate first step is contacting your veterinarian. Do not attempt to administer human pain medications such as ibuprofen, acetaminophen, or aspirin to pets. Many medications safe for humans are toxic to dogs and cats and can cause serious harm.

When calling your vet, be ready to describe what specific behaviors you observed, when they started, and whether any event (a fall, a new food, a recent vaccination) may be related. This context helps the veterinarian prioritize the visit and prepare for examination. Pain that involves difficulty breathing, collapse, inability to urinate, or pale gums should be treated as an emergency requiring immediate care.

Between noticing a concern and the vet appointment, keep your pet calm and limit physical activity. Avoid manipulating areas the pet seems to guard. Because some signs of pain overlap with signs of anxiety, our article on stress and anxiety in pets can help you distinguish between the two. For senior pets, who experience pain more frequently and may show even subtler signs, see what changes after age seven.

This article is for general informational purposes only and does not constitute veterinary or medical advice. Always consult a licensed veterinarian regarding your pet's specific health concerns.