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

Why Pets Hide Pain

Dogs and cats evolved as prey or predator species in which showing vulnerability could be dangerous. That instinct persists in domestic animals today, meaning a pet may be experiencing significant pain long before any obvious signal reaches you. This makes attentive observation — not just waiting for dramatic symptoms — essential for responsible pet ownership.

Pain in animals is broadly classified as either acute (sudden onset, typically from injury or a medical event) or chronic (gradual, often tied to conditions like arthritis or dental disease). Chronic pain is particularly easy to miss because the changes are slow and pets adapt their behavior incrementally. Owners sometimes attribute these changes to "just getting older" — but age-related slowing can itself be a pain signal worth discussing with a veterinarian. See also our article on managing a senior pet's health for what shifts to monitor as pets age.

Behavioral and Physical Signs to Watch For

The following cues, especially when new or progressively worsening, may indicate that your pet is in pain. No single sign is definitive; context and pattern matter.

Behavioral Changes

• Reduced activity or reluctance to move: Hesitation climbing stairs, jumping, or rising from rest can point to musculoskeletal pain.
• Altered temperament: A normally sociable pet that becomes withdrawn, irritable, or suddenly snaps when touched in a specific area deserves closer attention. For a deeper look at how dogs communicate discomfort through posture and expression, see our dog body language field guide.
• Changes in sleep or rest position: Repeatedly shifting positions, reluctance to lie down, or sleeping far more than usual.
• Appetite or thirst changes: Pain — especially oral or abdominal — can suppress a pet's desire to eat or drink.
• Excessive grooming or self-attention: Licking, chewing, or guarding a particular body area is a common self-soothing response to localized pain.
• Vocalization: Whimpering, growling when touched, or unusual vocalizations during normal activities like sitting or lying down.

Physical Signs

• Changes in gait: Limping, favoring a limb, or an altered stride that wasn't present before.
• Postural changes: Hunching, a tucked abdomen, or a head held lower than usual can indicate internal or spinal discomfort.
• Facial expression: In dogs, research — including work on the Canine Pain Scale — documents that squinting, tightened muzzle muscles, and flattened ears are associated with pain states.
• Coat and appearance changes: Neglected grooming (especially in cats) or a dull coat can be indirect signs of pain or underlying illness.

Cats often mask pain more effectively than dogs. Conditions like arthritis present differently in cats — reduced jumping height or avoidance of the litter box may be the only visible clues.

When to Contact Your Veterinarian

Not every behavioral change is an emergency, but some signs require prompt veterinary evaluation. Contact your vet the same day if you observe:

• Sudden inability to bear weight on a limb
• Crying out or yelping without clear cause
• Visible swelling, wounds, or obvious injury
• Straining to urinate or defecate, especially in cats (which can indicate a life-threatening blockage)
• Collapse, difficulty breathing, or extreme lethargy

For subtler or gradual changes — reduced activity, altered appetite, or shifts in temperament — schedule a routine appointment and describe what you've observed in detail. Note when the behavior started, how frequently it occurs, and whether anything seems to trigger it. This history is genuinely useful to your veterinarian and improves diagnostic accuracy.

Never administer human pain medications to pets. Common over-the-counter pain relievers — including ibuprofen, acetaminophen, and aspirin — are toxic to dogs and cats. Only use medications prescribed or explicitly approved by your veterinarian for your specific pet.

Excess body weight can amplify joint and musculoskeletal pain considerably. If your pet is carrying extra weight, that conversation is worth having with your vet as part of a broader pain management discussion — our article on how pet obesity affects the body explains the mechanisms involved.

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