This study aimed to determine the prevalence of osteoarthritis (OA) and associated clinical signs in young dogs (aged 8 months–4 years). Each joint was scored for pain reactions (0–4). Orthogonal radiographs of all joints were made under sedation. Each joint was scored for radiographic OA (rOA) severity. Clinical OA (cOA) was defined as an overlap of rOA and joint pain in ≥ 1 joint. The owners of 123 dogs agreed to participate. Overall, 39.8% (49/123) of dogs had rOA in ≥ 1 joint, and 16.3% (20/123) or 23.6% (29/123) dogs had cOA, depending on the cut-off value of joint pain; moderate (2), or mild (1), respectively. Owners of dogs with cOA observed signs of impairment in approximately 30% of cases. Only 2 dogs with cOA were receiving OA pain management. The most commonly affected joints in descending order of frequency were elbow, hip, tarsus, and stifle.
Radiographically visible OA is common in young dogs (8m- 4y), and 40–60% of dogs with radiographic OA had clinical OA. Pain appears underdiagnosed and undertreated in young dogs.