Why Dogs Hide Pain — and Why That Makes Your Job Harder
Dogs evolved as pack animals where showing weakness could mean losing status or becoming a target. This deep-rooted stoicism means many dogs will continue eating, wagging their tail, and greeting you at the door even when they are in significant discomfort. As an owner, you cannot rely on obvious distress signals alone. Pain recognition requires a trained eye for subtle changes in behaviour, posture, and movement.
Understanding how dogs communicate pain — and why they often do not — is the first step in becoming a better advocate for your pet's wellbeing.
Acute Versus Chronic Pain: Different Presentations
Pain in dogs falls broadly into two categories, and each tends to look different.
Acute Pain
Acute pain comes on suddenly, often after an injury or post-operatively. Signs tend to be more obvious because the dog has not yet adapted to the sensation. You may notice vocalisation (yelping or whimpering), sudden lameness, flinching when touched, or protective behaviour over a specific area of the body.
Chronic Pain
Chronic pain, such as that caused by arthritis or spinal disease, develops gradually. Dogs adapt their behaviour slowly, and owners often attribute changes to "getting older." This is one of the most common and dangerous misconceptions in veterinary medicine. A dog that is less willing to go upstairs, slower to rise from lying down, or generally quieter than usual may be living with ongoing pain that is entirely manageable with treatment.
Subtle Signs of Pain You Might Miss
The following signs are frequently overlooked, yet they are among the most reliable indicators that something is wrong:
- Repetitive licking or chewing of one area: If your dog keeps licking a paw, flank, or joint — even when there is no visible wound — this can indicate localised pain or discomfort.
- Altered gait: A slight change in the way your dog walks, a shortened stride, or a tendency to favour one limb warrants attention even if there is no obvious limping.
- Reluctance to jump: Hesitating before getting into the car or onto furniture, or needing coaxing to climb stairs, often signals musculoskeletal pain.
- Grumpiness or irritability: A dog that snaps when touched in a particular area, or that has become uncharacteristically withdrawn or short-tempered, may be reacting to pain rather than a personality change.
- Changes in facial expression: A tense brow, partially closed eyes, or ears held back flat can all indicate pain. Researchers have validated a "pain face" in dogs similar to what has been described in humans and other species.
- Altered posture: Hunching, a tucked abdomen, or an unusual stance (such as a "prayer position" with the front legs stretched and the bottom raised) can signal abdominal or thoracic pain.
- Changes in breathing: Shallow, rapid breathing at rest — when the dog is not hot or anxious — can be a pain response.
The Glasgow Composite Pain Scale
Veterinary professionals use validated tools to assess pain objectively. The Glasgow Composite Measure Pain Scale (CMPS) is one of the most widely used in clinical practice. It assesses several behavioural and physiological parameters — including vocalisation, attention to wound, mobility, and response to touch — and assigns a numerical score. This score helps vets determine the severity of pain and monitor the response to treatment.
While you as an owner do not need to score your dog formally, understanding that pain has measurable dimensions beyond simple yelping is helpful. A dog scoring low on vocalisation may still score high on mobility or posture, indicating significant discomfort. Ask your vet about pain scoring during post-operative check-ups or chronic disease management visits — it is a conversation worth having.
Pain as the Fifth Vital Sign
The World Small Animal Veterinary Association (WSAVA) has long advocated for treating pain as the fifth vital sign, alongside temperature, pulse, respiration, and blood pressure. This framing encourages vets — and owners — to assess pain at every health interaction, not just in obvious emergencies.
At home, this means building pain awareness into your routine. Run your hands over your dog's body regularly. Note any flinching, muscle tension, or areas your dog pulls away from being touched. Monitor energy levels, appetite, and willingness to engage in usual activities. Changes in any of these can be your earliest warning system.
A Wagging Tail Does Not Mean a Pain-Free Dog
This is perhaps the most important myth to dispel. Dogs wag their tails in a variety of emotional states — excitement, anxiety, submission, and greeting behaviour. A wagging tail in the consulting room, or at home, tells you nothing reliable about whether your dog is in pain. Many dogs in chronic pain will still greet their owners enthusiastically. Do not let a happy greeting reassure you that all is well if other signs suggest otherwise.
Pain recognition is a skill developed over time and in partnership with your vet. If you notice any combination of the signs described here, do not wait for things to become obvious. An early conversation with your veterinary practice is always the right move.
When to Act
If you suspect your dog is in pain, contact your vet promptly. Do not administer human pain medications such as ibuprofen, paracetamol, or aspirin — these are toxic to dogs and can cause serious harm. Your vet has safe, effective options for managing pain across a wide range of conditions, and earlier intervention almost always leads to better outcomes.
Being attuned to your dog's normal behaviour is your most powerful diagnostic tool. When something seems off, trust your instincts and get professional advice.