Determination of a dog's ability to see or the quality of its vision is not always straightforward. There are varying degrees of vision loss and many causes for reduced vision. Some causes may be apparent during the course of an examination, and in other instances may require additional diagnostics. Validated pet owner-directed questionnaires have been developed for use in assessing veterinary patients' quality of life (in association with a cancer diagnosis or other illnesses) and for behavioral disorders, and recently a visual function instrument was developed to aid in assessing quality of vision in dogs. In this Specialty Update we discuss the assessment of vision in dogs and the components of this pet owner questionnaire that can aid clinicians and owners in determining the quality of vision in dogs. Running time: 21 mins Free registration for Premium VetVine Membership subscribers: http://vetvine.com/article/181/evidence-based-update-subscriptions