What is the opposite gender of horse?

Opposite Gender of Horse

›  An adult male horse if left intact is called either a "stallion" or a "horse" (sometimes full horse); if castrated, it is called a gelding. In some cases, particularly informal nomenclature, a gelding under four years is still called a colt.

›  A young female horse is called a filly, and a mare once she is an adult animal.

Feminine of the horse is filly at young.

A colt is a male horse, usually below the age of four years.

List of Animal Names: Male, Female, and Young
Masculine and Feminine gender of animals List

Animal	Male	Female	Young
Ass	Jack	Jenny	Foal
Bear	Boar	Sow	Cub
Cat	Tom	Queen	Kitten
Cattle	Bull	Cow	Calf
Chicken	Rooster	Hen	Chick
Deer	Buck	Doe	Fawn
Dog	Dog	Bitch	Pup
Duck	Drake	Duck	Duckling
Elephant	Bull	Cow	Calf
Fox	Dog	Vixen	Cub
Goose	Gander	Goose	Gosling
Horse	Stallion	Mare	Foal
Lion	Lion	Lioness	Cub
Rabbit	Buck	Doe	Bunny
Sheep	Ram	Ewe	Lamb
Swan	Cob	Pen	Cygnet
Swine	Boar	Sow	Piglet
Tiger	Tiger	Tigress	Cub
Whale	Bull	Cow	Calf
Wolf	Dog	Bitch	Pup