Why Pets Hide Pain
Unlike humans, animals have a strong instinct to conceal vulnerability. In the wild, showing weakness can attract predators, so both dogs and cats have evolved to tolerate and mask discomfort remarkably well. This means that by the time a pet's pain becomes obvious, it may have been present for some time. Recognizing subtle, early signals is one of the most valuable skills a pet owner can develop.
Understanding these cues also matters during veterinary visits. Our guide to reading your pet's body language during a vet visit can help you advocate more effectively for your animal's comfort when you get there.
Behavioral Red Flags to Watch For
Changes in behavior are often the first — and most overlooked — indicators of pain. Because these shifts happen gradually, owners may attribute them to aging or mood rather than discomfort. Key behavioral signals include:
- Withdrawal or hiding: A normally social pet that seeks isolation may be protecting itself from being touched in a painful area.
- Reduced activity or reluctance to move: Hesitation to jump, climb stairs, or rise from rest can signal joint, muscle, or internal pain — particularly in senior pets whose health needs shift with age.
- Changes in grooming habits: Cats in pain may stop self-grooming, leading to a dull or unkempt coat. Conversely, excessive licking of a specific body area can signal localized discomfort.
- Aggression or irritability: A pet that snaps, hisses, or flinches when touched — especially in an area it previously tolerated — may be guarding a painful spot.
- Appetite or thirst changes: Pain disrupts normal eating patterns. A pet eating significantly less, or suddenly more, warrants attention.
Pain guarding
A behavior in which an animal protects a painful area by flinching, pulling away, or reacting defensively when that area is approached or touched.
Feline Grimace Scale
A validated veterinary tool that assesses pain in cats by scoring facial muscle tension, ear position, eye openness, and whisker posture. It helps clinicians rate pain levels in animals that cannot verbalize discomfort.
Vocalization
Sound-based communication by a pet — including whimpering, yowling, or growling — that can serve as a signal of distress or discomfort, though absence of vocalization does not rule out pain.
Baseline health status
A veterinarian's documented record of a specific animal's normal parameters — weight, vital signs, behavior — used as a reference point for detecting meaningful changes over time.
Vocalization such as whimpering, yowling, or unusual growling when at rest can also be telling, though some animals remain entirely quiet even when in significant discomfort.
Physical Signs That Suggest Discomfort
Physical changes are often easier to observe once you know what to look for. These include:
- Altered posture: A hunched back, lowered head, or tucked abdomen can all suggest pain. Animals in abdominal discomfort may stand with legs wider apart than usual.
- Facial tension: Squinting, partially closed eyes, flattened ears, or a tight muzzle can all indicate that a pet is hurting. Researchers have developed validated pain scales — such as the Feline Grimace Scale — specifically to assess these cues in cats.
- Changes in breathing: Shallow, rapid, or labored breathing at rest — without recent exertion — can be associated with pain, particularly chest or abdominal pain.
- Limping or uneven gait: Favoring a limb is a clear signal, but subtler asymmetries in movement can also indicate musculoskeletal issues.
- Excessive scratching or skin changes: While scratching often points to allergies or parasites, it can also reflect nerve pain or skin discomfort. See our overview of why your dog may be scratching for more context.
Never Give Pets Human Pain Medication
Common over-the-counter pain relievers such as ibuprofen and acetaminophen are toxic to both dogs and cats and can cause serious organ damage or death even in small doses. If you suspect your pet is in pain, contact your veterinarian before administering any medication. Only use medications specifically prescribed or approved by a licensed vet for your animal.
For a broader look at how body language connects to overall wellbeing, our article on body language signals owners often miss provides a helpful companion reference.
When to Contact Your Veterinarian
No single sign listed here is definitive proof of pain, and some of these symptoms overlap with conditions unrelated to discomfort. The threshold for calling your vet should be low — especially if multiple signs appear together, if a single sign is persistent, or if your pet is a senior animal. Digestive symptoms that accompany behavioral changes are worth particular attention; our guide on digestive upsets in pets explains when those warrant urgent care.
~80%
Dogs showing subtle-only pain signs
Veterinary behavior literature broadly estimates that the majority of dogs in pain show only subtle behavioral changes rather than obvious vocalizations.
2x/year
Recommended vet visits for senior pets
Many veterinary organizations recommend biannual wellness exams for dogs and cats considered senior, to catch changes earlier.
Do not attempt to manage suspected pain at home with human medications — many, including ibuprofen and acetaminophen, are toxic to dogs and cats. Only a licensed veterinarian can assess pain accurately and recommend safe, appropriate treatment. Routine wellness exams also give your vet a baseline for your individual animal, making it easier to detect meaningful changes over time.
This article provides general educational information about recognizing potential signs of pain in pets. It is not a substitute for professional veterinary diagnosis or treatment. Always consult a licensed veterinarian if you have concerns about your pet's health.