Iowa State University Veterinarian Records, RS 22/6/0/9, University Archives, Special Collections Department, Iowa State University, http://www.add.lib.iastate.edu/spcl/arch/rgrp/22-6-0-9.html
In the canine species there are many causes of chorioretinitis and detachment of the retina. Among these are: fungal infections such as Blastomycosis and Cocidiodomicosis; invasion by Toxoplasma organisms; trauma to structures of the eye with subsequent hemorrhage, infection or rupture of the vitreous; tumors of the choroid or retina; parasitic larval migrans such as Toxacara vanis; progressive hereditary diseases; and those of unknown etiology.
Milke, Barb and Carithers, R. W.
"Chorioretinitis And Detached Retina as Post-Distemper Lesions in the Canine,"
Iowa State University Veterinarian: Vol. 37
, Article 1.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol37/iss2/1