Moggy is an alternate name most commonly used in Commonwealth English for a mixed-breed or mongrel cat whose ancestry and pedigree are not known. Because of this mixed ancestry and free-breeding, a moggy can either be very healthy, or, if from an inbred feral colony, genetically unsound and sickly. However, as feral colonies are often left without any form of human intervention and veterinary attention, the sickly do not live past kittenhood, leaving the colony as a whole healthy.

A non-feral moggy makes an excellent household pet.

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