Importance of farm animal biodiversity in humankind security.

Entropion is the inversion of all or part of the margin of the eyelid such that the outer lid skin contacts the conjunctival and/or corneal surfaces, causing damage. The degree of entropion is considered to be mild, moderate and severe. Could be lateral, medial, angular and total; may affect the lower lid, or the uper lid. The total entropion is frequently seen in the Chow-Chow breed. This case reports 2 male Chow-Chow breeds, 3 and 4 years old, which were operated on twice for total entropion using classic techniques. This breed has prominent lateral and frontal folds, that cause the entropion. The classic techniques do not give the expected results and recurrences are common .These dogs can not see and the cornea is injured. The rhytidectomy is the only successful therapeutical option and it consists of the ablation of the prominent folds. The surgery was a success, both dogs can see and the corneal lesions healed.