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

Why Pets Conceal Pain

Across evolutionary history, showing weakness made animals vulnerable to predators and rivals. Even domesticated pets retain this instinct, meaning that by the time pain becomes outwardly obvious, it may already be significant. This is why reading your pet's body language is such a foundational skill — detecting discomfort early depends on knowing what normal looks like for your individual animal.

Both dogs and cats are capable of masking pain effectively, though they do so in distinct ways. Dogs may still greet you at the door while quietly limiting their range of motion. Cats often simply retreat and reduce activity, which owners may dismiss as typical feline independence. Rabbits, birds, and other companion animals are similarly skilled at concealing illness or injury.

Behavioral Signs to Watch For

Behavioral changes are usually the earliest and most reliable indicators that something is wrong. Key signs across species include:

• Withdrawal or reduced social interaction — A normally affectionate pet avoiding contact is a meaningful shift.
• Changes in appetite or water intake — Pain commonly suppresses eating and, in some cases, triggers increased thirst.
• Altered sleep patterns — Restlessness or, conversely, sleeping far more than usual.
• Increased irritability or aggression — A pet that snaps or growls when touched in a specific area is often communicating pain at that site.
• Excessive grooming or self-directed attention — Licking, biting, or scratching a particular area may indicate localized discomfort.
• Vocalization changes — Whimpering, growling, or unusual quietness, depending on the individual animal.

It is worth noting that these behaviors can also reflect stress, anxiety, or boredom. Our guide to decoding stress and anxiety in animal behavior can help you distinguish between emotional and physical causes.

Physical Signs That Suggest Pain

Alongside behavioral shifts, a range of physical cues can indicate pain:

• Altered gait or lameness — Favoring one leg, a stiff walk, or reluctance to jump or climb stairs.
• Postural changes — A hunched back, tucked abdomen, or low head carriage can all reflect musculoskeletal or visceral pain.
• Facial expression changes — Research in both dogs and cats has identified pain-associated facial action units, including squinting eyes, flattened ears, and tense muzzle muscles. Cat-specific facial signals are particularly nuanced and worth understanding.
• Changes in coat or grooming — A dull, unkempt coat may indicate the pet is unable or unwilling to groom due to discomfort.
• Rapid or shallow breathing at rest — Outside of heat or exercise, this can reflect pain-related physiological stress.

For a broader framework of which behavioral and physical shifts are clinically significant, see our companion piece on reading animal distress signs that warrant veterinary attention.

What to Do If You Suspect Pain

The single most important step is to contact your veterinarian. Do not attempt to diagnose the source of pain at home, and never administer human pain medications — drugs like ibuprofen, acetaminophen, or naproxen can cause serious organ damage or death in pets.

Before your appointment, document what you've observed: when the changes began, which behaviors or postures look different, and whether anything correlates with a specific activity or body part. This information significantly assists the vet's assessment.

If your pet's symptoms are severe — continuous crying, inability to walk, visible injury, or labored breathing — treat it as an emergency and seek immediate care. Preparing ahead of time by knowing your nearest emergency clinic is always worthwhile. Our checklist on what to have ready before a pet emergency can help you organize essential contacts and supplies in advance.

Also consider whether any routine at home may be contributing to the problem. Everyday habits that quietly harm pets covers common oversights that can cause cumulative physical strain.

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