Pets hide pain. Dogs hide it because their wild ancestors that showed weakness were attacked or driven from their packs. Cats hide it because they were solitary predators that became prey when injured. Both behaviors are deeply hardwired and persist even in pampered pets that have no actual reason to mask discomfort.
The result: by the time pets show obvious pain, the underlying problem is usually significant. Subtle signs that come earlier are what you need to learn to read.
This is the working guide to recognizing pain in dogs and cats, with the subtle signs most owners miss until they are pointed out.
For broader emergency context, see our pet first aid guide.
Why Pets Hide Pain
Three deeply rooted reasons:
Evolution. Animals that showed weakness in the wild became targets. The genes for hiding pain were passed on. Even thousands of years of domestication has not erased this.
Social status. In multi-pet households, a sick or weak animal can be challenged by housemates. Cats especially conceal weakness from other cats in the home.
Avoidance of intervention. Some pets learn that showing pain results in being picked up, taken to the vet, or handled in uncomfortable ways. They self-condition to hide it.
This means your job as an owner is harder than it should be. You have to learn to read what they are not showing you directly.
Dog Pain: 10 Subtle Signs
1. Changes in Posture
A subtly hunched back. A tucked tail when normally upright. Holding one leg up. Walking with a stiff gait. These are easy to miss because they often happen briefly and then resolve.
Watch for sustained changes in how your dog holds themselves.
2. Reduced Activity Level
A dog that used to jump on the couch now hesitates. A dog that ran to greet you now walks. A dog that demanded a walk now sleeps through it. Gradual reduction in activity is often pain-related, not just “getting old.”
3. Sleeping More
Increased sleep is normal in seniors but should be noted. Dogs in pain often retreat into sleep as a coping mechanism. Sustained increase warrants attention.
4. Decreased Appetite
Even mild pain can decrease appetite. Dental pain especially affects eating but causes the dog to keep trying because hunger remains. Watch for slower eating, dropping food, eating from only one side of the mouth.
5. Reluctance to Be Touched
A dog that always loved petting suddenly flinching when touched in certain areas. A dog that avoids being picked up when they previously enjoyed it. These signal localized pain.
6. Lip Licking and Yawning
Stress signals that can indicate pain. Frequent lip licking when not eating or drinking, frequent yawning when not tired, are calming signals dogs use when uncomfortable.
7. Panting Without Heat or Exercise
Panting is a normal cooling mechanism but also a pain response. A dog panting in air-conditioned comfort, without recent exercise, may be in pain.
8. Changes in Sleeping Position
A dog that always slept curled up now stretched out, or vice versa. A dog that slept on the floor now seeking soft surfaces. Position changes often reflect comfort needs from pain.
9. Aggression That Is Not Their Personality
A normally gentle dog snapping when touched. Growling at family members. New aggressive behavior is often pain-driven. Do not punish – investigate.
10. Vocalization Changes
New whimpering, especially when stretching or getting up. New yelping at normal touches. Quiet vocalization that you might miss if not listening.
Cat Pain: The Even Subtler Signals
Cats hide pain even better than dogs. The signs are subtler.
1. Decreased Grooming
Cats spend significant time grooming. A cat in pain often grooms less, especially in body areas that hurt to reach. Look for mats, greasy patches, decreased coat quality.
2. Overgrooming a Specific Area
The opposite signal. A cat that constantly licks one paw, one area of the leg, or one part of the body often has localized pain or irritation there.
3. Litter Box Changes
Difficulty getting into the box (high-sided boxes hurt arthritic cats). Vocalizing while in the box. Going outside the box. Constipation from straining position discomfort.
4. Hiding More
A cat that was previously social spending more time hidden is one of the most common early pain signals. Hiding under beds, behind furniture, in closets.
5. Decreased Jumping
Hesitating before jumping. Missing jumps they used to make easily. Choosing lower perches. Cats are athletic and changes here are meaningful.
6. Posture Changes
Hunched posture when sitting. Tense or “tucked” abdomen. Half-closed eyes (almost like squinting) for sustained periods. These all indicate discomfort.
7. Changes in Resting Patterns
Sleeping in unusual locations, sleeping more lightly, repositioning frequently as if uncomfortable. Cats in pain often cannot find a comfortable position.
8. Decreased Appetite
Subtle appetite decreases in cats are concerning because cats that stop eating develop hepatic lipidosis (a serious liver condition) quickly. Always investigate persistent appetite changes.
9. Aggression or Withdrawal
Either direction – a normally affectionate cat becoming withdrawn, or a normally calm cat becoming reactive. Both can be pain responses.
10. The Feline Grimace Scale
A scientific tool developed for assessing acute pain in cats. Watch for:
- Ears flattened or rotated outward
- Squinted or narrowed eyes
- Muzzle tension (sometimes visible as cheek tension)
- Whisker position changes (whiskers pulled back tight)
- Head position lowered
Cats showing several of these signs are typically experiencing meaningful pain.
Pain at Different Life Stages
Puppies and Kittens
Often more vocal about pain than adults but also more variable. A young pet that suddenly slows down, stops playing, or refuses to eat is showing something is wrong. They have not yet learned to hide pain as effectively.
Adult Pets
Peak hiding skill. Subtle signs may be all you get. Watch for changes from THIS pet’s normal baseline, not generic pet pain checklists.
Senior Pets
Many seniors live with chronic pain (arthritis especially) that owners attribute to “old age.” This is the largest underrecognized pain category. Senior pets often benefit significantly from pain management even when they are not showing obvious signs.
For senior cat specifics, see our senior cat care guide.
What Your Sitter Should Watch For
If you use a pet sitter, share your pet’s normal baseline:
- Normal energy level
- Normal eating speed and amount
- Normal greeting behavior
- Normal sleeping locations
- Any chronic conditions and their normal presentation
Then ask your sitter to note any departures from these patterns. The sitter does not need to be a vet – they need to be a careful observer who tells you when something is off so you can decide whether to act.
Sitter visit reports should include:
- Activity level relative to normal
- Eating and drinking
- Litter box or potty observations
- Posture and movement notes
- Any unusual behavior
For full sitter briefing details, see our what to tell your pet sitter before you leave post.
When to Call the Vet
A working threshold:
Call your vet within 24 hours:
- New persistent behavior change (lethargy, withdrawal, reduced appetite)
- New limping or stiffness
- New vocalization patterns
- Any consistent signs of pain even if mild
Call the ER vet immediately:
- Sudden severe pain (crying, panting, restlessness)
- Pain combined with other emergency signs (collapse, vomiting blood, difficulty breathing)
- Acute trauma
- Unable to walk
See our ER vet vs regular vet decision guide for full symptom triage.
Pain Management for Pets
A few notes on managing pain once recognized:
Never give human pain medications. Tylenol is highly toxic to cats. Ibuprofen and aspirin can cause severe GI bleeding and kidney damage in pets. Naproxen is similarly dangerous.
Vet-prescribed options include:
- NSAIDs (carprofen/Rimadyl, meloxicam/Metacam) – dog-specific formulations
- Gabapentin
- Tramadol
- Joint supplements (glucosamine, chondroitin, fish oil)
- Adequan injections for arthritis
- Specialty diets for joint health
Environmental modifications:
- Soft beds in warm locations
- Ramps for stairs and furniture
- Litter boxes with low sides for cats
- Non-slip surfaces for pets with mobility issues
Physical therapy:
- Veterinary physical therapists exist in Jacksonville
- Underwater treadmill therapy
- Cold laser therapy
- Acupuncture (for some practitioners)
Frequently Asked Questions
Can I give my dog aspirin for pain?
Strong recommendation: no, not without specific vet guidance. Even though some sources mention low-dose aspirin for dogs, it has significant GI and kidney side effects, interferes with future vet treatments, and is rarely the right choice. Call your vet for actual pain management options.
My older cat has been hiding more. Is that just age?
Maybe, but treat it as pain or illness until ruled out. Many “old cat” behavior changes are actually treatable medical conditions caught late because owners attributed them to age. Vet visit is appropriate.
Should I give my dog joint supplements as a preventive?
For breeds predisposed to joint issues (large breeds, brachycephalic, etc.), joint supplements starting around age 5-7 can be beneficial. Discuss with your vet for specific recommendations. They are generally low-risk.
How do I know if my pet’s pain is acute (sudden) or chronic (longstanding)?
Sudden onset usually means trauma, acute injury, or sudden medical event – typically warrants urgent care. Gradual onset over weeks/months is often chronic conditions like arthritis or dental disease – regular vet visit appropriate.
Can pets have chronic pain conditions like humans do?
Yes. Arthritis, intervertebral disc disease, chronic dental pain, certain neurological conditions can all cause ongoing pain in pets. Modern veterinary medicine has many options for managing chronic pain.
What about cannabis or CBD for pet pain?
Mixed evidence and limited regulation. Some veterinary studies suggest modest benefit for some conditions; product quality varies widely. If interested, discuss with your vet rather than self-experimenting.
You Know Your Pet’s Baseline
The most reliable pain detector is an attentive owner who notices when their pet departs from their normal patterns. Generic checklists help, but knowing YOUR pet’s normal is what catches pain early.
If you travel and want a sitter who notices the same subtle changes you do, our in-home pet care and senior and special needs pet care services treat observation and documentation as core practice.
