What is the femenine form of equestrian Paul and Carol?

Answer 1

A pony is any small breed of horse and there is no gender differentiation. A foal is a young horse (or a young pony) of either sex. 'Colt' is often used to refer to either sex, but it is correctly used only when referring to a male. A female foal is called a 'filly.'

Answer 2

Equestrian, used as either a noun or adjective, is genderless. It can be used for both men and women.