Dogs hide pain instinctively, a holdover from their evolutionary past where showing vulnerability could be dangerous. But they can’t hide it completely. Pain changes how a dog moves, holds its body, interacts with people, and even how its face looks. Knowing what to watch for can help you catch a problem early, sometimes before it becomes serious.
Changes in Posture and Movement
The most visible signs of pain in dogs are physical. A dog in discomfort will often change the way it sits, stands, or lies down. You might notice a hunched posture with a tense abdomen, an arched back, or a head carried unusually low. Some dogs hold themselves rigidly, as if bracing against the pain, while others guard a specific area of their body by shifting their weight away from it or curling around it protectively.
One distinctive posture veterinarians recognize is called the “prayer position,” where a dog stretches its front legs forward and lowers its head while keeping its hind end raised. This position often signals abdominal pain, such as from pancreatitis or a gastrointestinal obstruction.
The tail is another reliable indicator. A dog in pain may hold its tail stiff, tuck it tightly between its hind legs, or swing it abruptly rather than with its usual relaxed wag. Limping or favoring one leg is obvious, but subtler signs include general stiffness, reluctance to walk, difficulty getting up from a lying position, or hesitation before climbing stairs or jumping onto furniture. Any of these can point to joint pain, soft tissue injury, or deeper internal discomfort.
Facial Expressions
Dogs in pain make specific facial changes that are easy to miss if you’re not looking for them. The clinical tool used by many veterinarians, the Colorado State University Canine Acute Pain Scale, identifies a cluster of features that create what’s described as a “worried” facial expression: droopy or flattened ears, arched eyebrows, and darting eyes that don’t settle on anything.
Other facial signs include tension around the eyes and jaw, tightening of the muscles across the muzzle, and retraction of the corners of the lips. In more severe pain, you may notice dilated pupils. These changes can be subtle on their own, but together they create a face that looks different from your dog’s normal resting expression. If your dog’s face looks “off” and you can’t quite place why, pain is worth considering.
Behavioral Shifts
Sometimes the clearest sign of pain is a change in personality. Behavioral changes fall into two categories: things your dog stops doing and new behaviors that appear.
Lost normal behaviors include:
- Decreased activity, including less interest in walks, play, or moving around the house
- Withdrawal from family members or other pets
- Reduced appetite or reluctance to eat
- Less rest, paradoxically, because the dog can’t get comfortable
New abnormal behaviors include:
- Aggression, especially when touched near the painful area, as a defensive reaction to avoid contact that might make things worse
- Restlessness, pacing, or an inability to settle
- Hiding or seeking isolation
- Inappropriate elimination, such as urinating or defecating indoors
- Fear reactions that seem out of proportion to the situation
Pain can also amplify existing anxieties. Dogs with noise sensitivity who are also in pain are more likely to generalize their fear, becoming reactive to environmental triggers or other dogs that didn’t bother them before. If your dog suddenly seems more fearful or anxious than usual, underlying pain could be a factor.
Excessive Licking and Grooming
Dogs commonly lick areas of their body that hurt. This can look like obsessive grooming focused on one spot, repeated licking of a paw or joint, or chewing at a particular area even when the skin appears healthy. If there’s no sign of a skin infection, allergy, or external irritation, veterinarians consider arthritis, soft tissue injuries like sprains or strains, fractures, and other sources of pain as likely explanations.
Excessive grooming over a joint is especially telling. It can indicate degenerative joint disease even before you notice a limp. Some dogs will also engage in repetitive behaviors, like circling or paw-licking, that seem compulsive but are actually driven by chronic discomfort.
Vocalizations
Whimpering, whining, yelping, or groaning can all signal pain, particularly if they happen when your dog moves, is touched, or tries to change position. Some dogs vocalize more when they’re in acute, sudden pain, like after an injury. Others may cry out only when a specific area is contacted.
But silence doesn’t mean comfort. Many dogs, especially stoic breeds, go quiet when they’re hurting. They may simply become still and withdrawn rather than vocal. If your normally talkative dog goes silent, or your quiet dog starts whimpering, both deserve attention.
Physiological Signs You Can Observe
Pain triggers measurable physical responses. An elevated heart rate is common, and you may notice your dog’s breathing becomes shallow and rapid rather than deep and relaxed. These changes are your dog’s stress response activating in reaction to discomfort. Dilated pupils can also appear, though this sign has multiple possible causes beyond pain.
Panting at rest, especially in a cool environment where your dog has no reason to be hot, is another physiological red flag. Trembling or shaking that isn’t related to cold or excitement can also indicate that a dog is processing significant discomfort.
How Chronic Pain Looks Different
Acute pain, like from an injury or surgery, tends to produce obvious signs: yelping, limping, guarding, restlessness. Chronic pain is harder to spot because it develops gradually. Your dog adapts over weeks or months, and the changes can be so incremental that they look like normal aging.
Osteoarthritis is the most common source of chronic pain in dogs. Signs include stiffness that’s worse after rest, a change in gait, reluctance to exercise, difficulty navigating stairs, trouble jumping onto surfaces they used to reach easily, and muscle wasting in the affected limb. You might also see sudden irritability or snapping, which owners sometimes attribute to the dog “getting grumpy with age” when the real cause is joint pain.
One important distinction: chronic pain often shows up first as a decrease in what your dog does rather than any dramatic new behavior. If your dog gradually stops playing, takes shorter walks, or sleeps more, those aren’t necessarily just signs of getting older. They’re worth investigating, especially in breeds prone to joint disease.
How Veterinarians Assess Pain
Vets use structured tools to evaluate pain because dogs can’t describe what they’re feeling. The most widely used is the Glasgow Composite Measure Pain Scale, which scores dogs across six categories: vocalization, attention to a wound, mobility, response to touch, demeanor, and posture. A score of 5 or higher out of 20 typically triggers additional pain relief.
For chronic pain, your observations as the owner carry significant weight. Current veterinary guidelines from the American Animal Hospital Association emphasize capturing the pet owner’s evaluation because you see your dog in everyday life, not just in the stress of a clinic visit. Keeping notes on changes you’ve noticed, even small ones, gives your vet useful information. Things like “she stopped jumping on the couch three weeks ago” or “he growls now when I pick him up” can be more diagnostic than anything observed in a 15-minute exam.