The following is excerpted from one of my fave sites, (Vetfolio) for my notes category. (For future reference but linked for bibliographical accuracy.)
Limbal melanomas are the most common ocular melanomas in dogs, accounting for 20% to 50% of these tumors,17-19 and are less common in cats.7 In both species, this tumor is typically a smooth, black or heavily pigmented, subconjunctival mass ( FIGURE 3 ) that is noted incidentally by an owner or a veterinarian.20,21 These tumors usually involve the adjacent cornea and/or conjunctiva and, much less commonly, may extend intraocularly.20,21 Differentiating a tumor of limbal origin from extension of an intraocular uveal tumor into the sclera may be difficult with advanced disease. Most canine limbal melanomas are located along the superior half of the limbus, and German shepherds appear to be affected more frequently than other breeds.17,19,22
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Dr Erik Johnson is a Marietta, Georgia Veterinarian with a practice in small animal medicine. He graduated from University of Georgia with his Doctorate in 1991. Dr Johnson is the author of several texts on Koi and Pond Fish Health and Disease as well as numerous articles on dog and cat health topics.