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Obesity: The condition of being obese; increased body weight caused by excessive accumulation of fat.

Ocicat: A new breed of cat characterized by a coat with spots that resemble a wild cat.

Odd-Eyed: Eyes of different color, such as one brown eye and one blue eye.

Oestrus: The periodic state of sexual excitement in the female of most mammals, excluding humans, that immediately precedes ovulation and during which the female is most receptive to mating; heat. Also known as estrus.

Olfactory: Of, relating to, or contributing to the sense of smell.

Olfactory Mucosa: The region of the nose that is responsible for the detection of smells.

Omnivore: A person or animal that feeds on both animal and vegetable substances

Onychectomy: The medical term for declawing, the surgical removal of a cat's claws.