Reading the Signs: How Pets Communicate Pain Without Words

Why Pets Hide Pain

Evolutionary biology works against pet owners trying to spot discomfort. Both dogs and cats are descended from animals that concealed vulnerability to avoid appearing weak to predators or competitors. This instinct persists in domestic pets today — meaning a cat curled quietly in a corner or a dog who simply seems "off" may be experiencing significant pain rather than just having a low-energy day.

The American Veterinary Medical Association (AVMA) notes that pain assessment in animals is a recognized clinical challenge precisely because behavioral suppression is so common. Owners are often the first to notice subtle changes, making your daily observations one of the most important diagnostic tools available to your veterinarian.

Understanding the difference between pain signals and other behavioral changes — such as those seen in anxiety or stress-related conditions — helps you report accurately and helps your vet respond faster.

Behavioral Cues That Signal Pain

Behavioral changes are typically the earliest indicators that something is wrong. Because these shifts can be gradual, they are easy to normalize or dismiss. The following patterns warrant attention:

• Withdrawal and reduced interaction: A pet that used to greet you enthusiastically but now retreats, hides, or avoids being touched may be protecting a painful area.
• Changes in grooming habits: Cats in pain may stop grooming altogether (resulting in a dull, matted coat) or over-groom a specific spot, which can indicate localized discomfort. Changes in coat quality can also overlap with nutritional issues — see signs your pet's diet may not be working for comparison.
• Aggression or irritability: A normally gentle pet that suddenly snaps, hisses, or growls when touched in a particular area is communicating pain directly. This is not a temperament problem — it is a symptom.
• Reduced appetite or difficulty eating: Pain anywhere in the body can suppress appetite. Difficulty chewing specifically, or dropping food while eating, may point to dental disease — a frequently overlooked source of chronic pain in pets.
• Vocalization changes: Whimpering, whining, yowling, or unusual vocalizations — especially when moving or being handled — are direct pain signals, though many pets remain silent even in severe discomfort.
• Restlessness or inability to settle: A pet that repeatedly lies down and gets back up, paces, or seems unable to find a comfortable position may be managing pain with movement.

Physical Signs Owners Can Observe

In addition to behavioral shifts, several physical signs can indicate pain:

• Postural changes: Hunching, a tucked abdomen, or reluctance to bear weight on a limb are visible signs of discomfort. Cats in abdominal pain often adopt a loaf-like, guarded posture with all limbs tucked tightly beneath them.
• Facial expression: Research published in journals including Pain has identified consistent facial action units in animals experiencing pain — including squinting eyes, flattened ears, a tense muzzle, and whisker changes in cats. This body of work has informed clinical pain scales used by veterinarians.
• Changes in breathing: Shallow, rapid, or labored breathing that is not explained by heat or exercise can signal pain, particularly chest or abdominal pain.
• Reduced mobility: Stiffness when rising, reluctance to climb stairs, or hesitation jumping onto favorite surfaces are classic signs — especially relevant in senior pets, in whom these signs may reflect arthritis or other chronic conditions.

This article is for general educational purposes only and is not a substitute for professional veterinary advice. If you suspect your pet is in pain, contact a licensed veterinarian promptly.