Patellar luxation is among the most common orthopedic conditions in small breed dogs, with welfare implications ranging from mild to severe depending on grade.
Dogs with mild patellar luxation may show only intermittent skipping steps suggesting momentary discomfort during patella relocation, while those with severe luxation experience continuous pain from abnormal patella positioning and secondary joint damage. The progressive nature means welfare deteriorates without appropriate management. Grade 3-4 cases develop muscle atrophy, compensatory gait changes, and secondary cruciate ligament damage that compound suffering. Surgical correction of significant luxation provides welfare benefit through restoration of normal patella tracking, reduced pain, and prevention of secondary joint deterioration. Breeding programs avoiding dogs with known patellar luxation reduce the prevalence of this hereditary condition in future generations.