Anesthesia and sedation resulted in significant attenuation and delay of ERG responses in dogs. Chemical restraint of dogs had no consistently significant effect on low- or high-frequency noise levels or on observer perception of signal quality.

Retinopathy observed in German Shepherd dogs is characterized by areas of tapetal hyper-reflectivity with pigmented centers. The underlying causes of retinopathy in German Shepherd dogs remain unknown, although husbandry conditions and proximity of the lesions to blood vessels may suggest an association with physical exertion or circulatory disorders, respectively.