Habit: A recurrent, often unconscious pattern of behavior that is acquired through frequent repetition.

Half-Pedigree: A term referring to a cat with one pedigree parent. In the strictest terms, however, a half-pedigree is still considered a mixed breed.

Hand-Feed: The process of feeding a cat periodically throughout the day and for a limited time.

Havana Brown Cat: A moderately sized, muscular shorthair cat with a brown or reddish-brown coat and green eyes.

Haw: A nictitating membrane, especially of a domesticated animal.

Heartworm: A filarial worm (Dirofilaria immitis) transmitted by mosquitoes and parasitic in the heart and associated blood vessels of dogs and other canids.

Heat: Seasonal period of the female. Estrus, in season.

Hemorrhage: Excessive discharge of blood from the blood vessels; profuse bleeding.