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Ophthalmic: Of or relating to the eye; ocular.

Orchidectomy: See Neuter

Oriental Shorthair Cat: A breed of cat with a short, close-lying coat that is finely textured and glossy.

Otitis Media: Infection of the middle ear.

Otodectes Cyanotis: See Ear Mites

Outbreeding: The process of mating unrelated individuals in order to improve vigor or type.

Outcrossing: The mating of unrelated individuals of the same breed.

Ovaries: The usually paired female or hermaphroditic reproductive organ that produces ova and, in vertebrates, estrogen and progesterone.

Ovariohysterectomy: The surgical removal of one or both ovaries and the uterus. Also called oophorohysterectomy.

Ovulate: To produce ova; discharge eggs from the ovary.