Reading the Signs: How Pets Communicate Pain and Discomfort

Why Pets Don't Show Pain the Way We Expect

Both dogs and cats are descended from animals that survived by concealing weakness from predators. This evolutionary trait hasn't disappeared in our household companions — it means pets often mask discomfort until it becomes significant. By the time a clear sign appears, the underlying issue may have been present for some time.

This is why attentive, routine observation matters more than waiting for an obvious signal. You are your pet's most consistent observer, and familiarity with their normal behavior is your most powerful diagnostic tool. Subtle deviations — a dog that's slightly less enthusiastic at mealtime, or a cat that no longer jumps onto their favorite chair — can carry real clinical weight.

Common Behavioral Signs of Pain in Dogs

Dogs communicate discomfort through a range of behavioral shifts. While some signs are obvious, many are easy to dismiss without context. Key indicators to watch for include:

• Changes in activity level: Reluctance to climb stairs, jump, or go for walks they normally enjoy
• Altered posture: A hunched back, tucked abdomen, or a reluctance to lie down and get back up
• Vocalization: Whimpering, whining, or growling when touched in a specific area
• Aggression or withdrawal: A normally social dog that suddenly snaps when approached, or retreats and isolates
• Changes in appetite or water intake: Eating significantly less, or showing disinterest in food or water
• Excessive licking or chewing: Focused grooming of one area may indicate localized pain or injury

It's also worth noting that some dogs in pain become unusually clingy rather than withdrawn. Behavioral changes can go in both directions, which is why knowing your individual pet's baseline is so important. For context on how pain-related behaviors can sometimes be confused with anxiety, see our article on separation anxiety in dogs.

How Cats Signal Pain Differently

Cats are often described as stoic, and that reputation is earned. Feline pain signals tend to be even more understated than those in dogs, and many owners miss them entirely. Common pain indicators in cats include:

• Reduced grooming or over-grooming: A coat that looks unkempt can signal the cat can't groom comfortably; excessive grooming of one spot may indicate soreness there
• Litter box avoidance: Pain while posturing to use the box — especially common with arthritis or urinary conditions — may lead to accidents elsewhere
• Facial expression changes: Research in veterinary science has identified the "feline grimace scale," which includes narrowed eyes, flattened ears, and a tense muzzle as pain indicators
• Reduced interaction: Hiding, avoiding being held, or no longer greeting family members
• Decreased jumping or climbing: Cats with joint pain often stop accessing elevated surfaces they previously used regularly

For a broader look at feline body language beyond pain signals, our cat body language field guide offers a comprehensive reference.

“Cats are masters of disguise when it comes to pain. By the time a cat is showing obvious signs of discomfort, the condition is often well advanced. Owners who know their cat's individual habits and personality are far better positioned to catch problems early.”

— Veterinary Pain Management Consensus Panel, Published guidance from the American Animal Hospital Association on feline pain recognition

Physical Signs That Accompany Pain

In addition to behavioral changes, physical signs can confirm that something is wrong. These include:

• Lameness or favoring a limb: Inconsistent weight-bearing is a straightforward sign of musculoskeletal pain
• Visible swelling or wounds: Redness, heat, or swelling around a joint or body part
• Changes in breathing: Rapid or shallow breathing at rest can accompany significant pain in both species
• Weight loss: Unexplained weight loss may indicate chronic pain affecting appetite or an underlying illness — see our resource on healthy weight in pets to better understand what normal body condition looks like
• Eye appearance: Squinting, watery eyes, or a third eyelid (nictitating membrane) becoming visible can indicate pain, particularly ocular pain

Physical signs alone rarely give the full picture. They are most useful when interpreted alongside behavioral context.

When to Seek Veterinary Care

Pain assessment in animals is a clinical skill — no article can replace a hands-on veterinary examination. Any of the signs described above, particularly when they appear suddenly or persist for more than a day or two, warrants a call to your veterinarian.

Certain presentations require urgent attention: labored breathing, inability to stand or walk, screaming or continuous vocalization, or a distended abdomen are examples of situations that should not wait. Our companion article on emergency vs. non-emergency pet symptoms provides a practical framework for making that call.

Never administer human pain medications to pets without explicit veterinary guidance. Many common over-the-counter analgesics — including ibuprofen and acetaminophen — are toxic to dogs and cats, even in small doses.

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