Learn the behavioral, mobility, and physical signs of pain in dogs, how to track changes, and when discomfort needs prompt veterinary attention.
Dogs instinctively hide pain, so obvious signs usually mean discomfort has been building for a while. Watch for behavioral shifts (withdrawal, irritability, appetite changes), mobility problems (limping, stiffness, reluctance to jump), and physical cues (panting at rest, trembling, tense facial expression). Track what you see with video and notes, share them with your vet, and never give human pain medication without veterinary guidance — common drugs like ibuprofen and acetaminophen are toxic to dogs.
You know your dog. You know how they move in the morning, what makes them excited, how they settle down at night. When pain enters the picture, something shifts — but the shift is often subtle enough to dismiss as "getting older" or "having an off day."
Dogs evolved to mask pain. In the wild, a visibly injured animal draws predators. That survival instinct stays strong in domestic dogs, which means by the time signs of pain in dogs become obvious to you, the discomfort may have been present for days or weeks.
This guide walks through what to look for, how to document it, and when the situation calls for a vet.
For related guidance, see quality of life assessment for dogs.
A dog in pain may pull away from the activities and interactions it normally enjoys. You might notice:
These changes are easy to misread. Withdrawal gets mistaken for tiredness. Irritability gets blamed on mood. If the change persists for more than a day or two, take it seriously.
Pain disrupts routines:
No single sign is diagnostic. The pattern matters — two or three changes happening together, or one change that persists, is a reason to look deeper.
Musculoskeletal pain is often the easiest to spot because it directly affects how a dog moves:
Watch for asymmetry. A dog that always lies on one side, always turns its head one direction, or always starts walking with the same leg may be compensating for pain on the opposite side.
Physical signs of pain that do not involve movement:
Cats share many of these signs but express them differently. Cats in pain often stop grooming (leading to matted fur), hide more, reduce eating, and show changes in facial expression — the Feline Grimace Scale is a validated tool for scoring feline pain based on ear position, eye shape, muzzle tension, and whisker angle.
If you suspect your dog is in pain but are not sure, start documenting. Vets rely heavily on owner observations, and a clear record is far more useful than a vague description at the appointment.
What to record:
Even a few days of notes can reveal patterns that are not obvious in the moment. Use your phone's notes app, a notebook, or a simple spreadsheet.
Several validated pain assessment tools exist:
These tools help you organize what you are seeing and communicate it to your vet. They do not replace a physical examination. Pain assessment in animals is complex — a dog may score low on a home scale but still have significant internal pain that only a clinical exam or imaging can identify.
Use the scales as a framework, not a verdict.
Contact your veterinarian or an emergency clinic immediately if your dog shows:
These signs suggest acute, severe pain that may indicate a surgical emergency, fracture, spinal injury, bloat, or internal bleeding. Do not wait to see if it improves.
For gradual changes — a slow decline in activity, a limp that comes and goes, a shift in appetite over weeks — schedule an appointment rather than waiting for a crisis. Many owners dismiss chronic pain as "normal aging," but pain from arthritis, dental disease, or internal conditions is treatable. Your dog does not have to live with it.
This point deserves its own section because the consequences are severe.
Ibuprofen (Advil, Motrin) can cause kidney failure and gastrointestinal ulceration in dogs, even at relatively low doses.
Acetaminophen (Tylenol) is toxic to dogs at doses commonly used in humans and can cause liver failure. In cats, even a single standard dose can be fatal.
Aspirin is occasionally used in veterinary medicine, but dosing, frequency, and drug interactions must be managed by a vet. Self-dosing at home risks stomach ulcers and bleeding disorders.
Naproxen (Aleve) is extremely dangerous for dogs — one or two tablets can cause life-threatening toxicity.
If your dog is in pain and you cannot reach a vet immediately, keep the dog quiet and comfortable, restrict movement, and do not give any medication. A well-intentioned dose of a human painkiller can turn a manageable problem into a poisoning emergency.
Your veterinarian has access to dog-safe pain medications — NSAIDs formulated for canine use, gabapentin, tramadol, and other options — that can be dosed safely for your dog's weight and condition.
Pain is not something your dog should just "deal with." If you are noticing changes, trust your instincts — you know your dog better than anyone. Write down what you see, record a video, and bring it to your vet. Early intervention often means better outcomes and less suffering.
This article is for informational purposes only and does not replace professional veterinary advice. If your pet shows signs of illness, consult a licensed veterinarian.