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.