A "cow with long hair" is a type of cattle characterized by an extended, flowing coat. The most famous breed of long-haired cow is the Highland, a hardy breed native to the Scottish Highlands.
Long-haired cows have a number of advantages. Their coats provide insulation from cold and wet weather, helping them to survive in harsh climates. Additionally, their hair can be used to produce high-quality textiles, such as wool and cashmere.