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Tumours of various types occur among captive fur animals to about the same extent as among other species of domestic animals. In the case of fur animals, however, tumours generally can be considered simply as incidental observations at autopsy. As a cause of death, tumours have only secondary significance and this may at least partially depend upon these animals seldom attaining old age in captivity (Momberg-J¢rgensen, 1952). The present article deals with a hereditary form of hyperplastic gingivitis in captive silver foxes.