This article is a review of the literature on dentigerous cysts in animals. Three different lesions have been referred to in the veterinary literature as dentigerous cysts. The first of these cysts, similar to those that occur in human beings, is extremely rare. The second lesion, an odontogenic cyst located in the anterior mandibles of mature sheep, is quite common in New Zealand and parts of Britain. The third is actually a teratoma that contains teeth and is found in the temporal region of young horses; it is also rare.