When a dog yelps after stepping on something sharp, most owners react immediately. But when that same dog starts sleeping in odd positions, trailing its owner from room to room, or quietly refusing to finish a walk, the response is often a shrug. Must be getting older. Probably just anxious.
According to a peer-reviewed study published in PLOS ONE in April 2025, those assumptions may be costing dogs weeks or months of untreated pain. Researchers led by Luciana Assis at the University of Bristol surveyed 530 dog owners and 117 non-owners, presenting them with 17 specific behavioral signs and three written case scenarios designed to test whether people could tell when a dog was hurting. When the cues were dramatic, participants spotted pain reliably. When the cues were subtle, they frequently missed it.
What the researchers tested and what they found
The study recruited 647 participants through an online questionnaire built around three vignette cases, each depicting a dog with a different symptom profile. One case described an obvious injury. Another presented a dog that was restless at night, following household members from room to room, and cutting walks short. Veterinary clinicians recognize all three of those behaviors as markers of chronic pain, but participants were far less likely to flag pain as the probable cause in the subtle scenario than in the injury case.
The mean likelihood ratings in the study’s supplementary data show a clear gap. When asked to explain their reasoning, many participants defaulted to behavioral or emotional explanations: separation anxiety, boredom, age-related decline. The pattern held across owners and non-owners alike. Notably, owning a dog did not consistently improve a person’s ability to catch the quieter signals.
That finding matters because chronic pain in dogs rarely looks like acute distress. A dog developing osteoarthritis or a slow-building soft tissue injury will not necessarily yelp or limp. Instead, it may become less playful, more clingy, or reluctant to jump onto furniture it once cleared without hesitation. When owners read those shifts as normal aging or personality quirks, the dog keeps hurting without treatment. Veterinary researchers estimate that chronic pain affects a significant portion of the adult dog population, particularly in breeds prone to joint disease, though precise prevalence figures vary across studies.
Where the evidence has limits
The study’s design shapes how far its conclusions can reach. All 647 participants responded to written scenarios online, meaning researchers measured recognition ability in a controlled format, not in a living room where familiarity with a pet’s daily habits can dull attention to gradual change. Someone who correctly identifies pain in a vignette might still overlook the same signs unfolding slowly in their own dog over weeks.
There is also no longitudinal follow-up. The research captures a single snapshot of recognition ability, not a before-and-after measure of whether scenario-based training actually changes owner behavior over time. That question remains open as of May 2026.
Separate peer-reviewed work published in the Journal of Veterinary Behavior has found that owners’ recognition of pain shifts depending on a dog’s age and life stage, with changes in younger dogs noticed more readily than changes in older animals. That finding aligns with the PLOS ONE results but comes from a different sample and methodology, so the two studies reinforce each other without fully replicating each other’s conditions.
Economic data on how often missed pain leads to delayed veterinary visits or worse clinical outcomes is also absent from the available literature. The welfare case is strong on its face, but no published research has yet put a dollar figure on the cost of late detection.
Why subtle pain looks like something else
A 2020 review published in the journal Animals synthesized existing research on how pain manifests as behavioral change in cats and dogs and is frequently misattributed as a purely behavioral problem. Now more than six years old, the review remains one of the most cited sources on this topic, and no superseding systematic review covering the same scope has appeared in the peer-reviewed literature as of May 2026. The review identified irritability, aggression, reduced play, and altered social interaction as common pain-driven behaviors that owners, and in some cases veterinary professionals, mistake for temperament issues. When pain goes unrecognized, the authors concluded, animals experience prolonged suffering, and households may face safety risks from a pet that becomes aggressive because of untreated discomfort.
The underlying biology works against easy detection. Dogs are descended from predators that benefited from concealing weakness. A limping wolf in a pack is a vulnerable wolf. That evolutionary pressure means domestic dogs often suppress overt pain signals, particularly with chronic conditions that build gradually. The result is a communication gap: the dog is hurting, but its instinct is to hide it, and its owner’s instinct is to interpret the remaining behavioral shifts as something benign.
What owners can do with this information
The practical step is straightforward. If a dog’s routine shifts in ways that lack an obvious external cause, a veterinary pain assessment is a reasonable next move. A dog that suddenly avoids stairs, pants at rest, sleeps in unusual positions, or stops greeting people at the door could be signaling pain rather than simply aging or feeling off.
The WSAVA Global Pain Council guidelines, most recently updated in 2022 and published in the Journal of Small Animal Practice, provide a clinical framework veterinarians use to evaluate pain across species. Owners can ask their vet whether a structured pain scoring tool has been applied during routine checkups, especially for dogs over age seven or breeds predisposed to joint conditions like hip dysplasia or intervertebral disc disease.
The PLOS ONE data do not suggest that owners are careless. They suggest that even attentive people struggle with cues that dogs are built to suppress. Recognizing that blind spot is the starting point. Structured tools, whether used in a veterinary office or encountered through educational resources like the scenarios in this study, can sharpen the skills that instinct alone does not reliably provide.
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*This article was researched with the help of AI, with human editors creating the final content.
