AtrophyDog DiseasesRetinal DegenerationRetinitis PigmentosaDogsRetinaEye ProteinsPedigreeRetinal DiseasesElectroretinographyFundus OculiMuscular AtrophyPolymorphism, Single-Stranded ConformationalOptic AtrophyMuscular Atrophy, SpinalMultiple System AtrophySpinal Muscular Atrophies of ChildhoodOlivopontocerebellar AtrophiesSupranuclear Palsy, ProgressiveGyrate AtrophyMagnetic Resonance ImagingGeographic AtrophyAphasia, Primary ProgressiveDisease ProgressionSurvival of Motor Neuron 1 ProteinMuscular Disorders, AtrophicBrainOptic Atrophy, Autosomal DominantSMN Complex ProteinsMultiple Sclerosis, Chronic Progressive