What is a male horse that is at least four years old called?

A male horse that is at least four years old is referred to as a stallion. This term specifically designates an intact male horse that has reached maturity and is capable of breeding. The age of four is typically when many male horses reach sexual maturity, allowing them to be considered for breeding purposes. Stallions often exhibit certain behaviors associated with their breeding status, which can include more pronounced territoriality and a desire to seek out mares.

Understanding the distinctions among the terms for male horses is essential. A gelding, for instance, is a male horse that has been castrated, thus eliminating its ability to breed and typically affecting its behavior. A colt generally refers to a young male horse, usually under the age of four, and may not yet be fully mature. The term stud can sometimes refer to a stallion used for breeding purposes but is not specifically tied to age or maturity. Thus, calling a male horse that is at least four years old a stallion accurately reflects its maturity and breeding capabilities.