Forty-seven owners of 48 dogs surgically treated for cranial cruciate ligament deficiency were asked to assess the outcome of treatment at one year postsurgery. A standard visual analogue scale assessment tool was used in all cases and owners were asked to score a variety of generic and disease-specific features. The reliability and responsiveness of the assessment tool were estimated and found to be acceptable; generic features, such as 'level of disability', showed the greatest reliability and responsiveness. The results of assessments by owners were compared to assessments by a veterinary surgeon but few significant correlations were found. Assessments by owners appear to be a useful outcome measure in this disease but are unlikely to be directly comparable to assessments by a veterinary surgeon.