A filly is a young female horse that hasn’t reached full adult size yet. In plain words, it’s a girl horse under four years old.
People at the racetrack, on farms, or just chatting about horses use the word all the time. You’ll hear, “That chestnut filly ran a great race today,” or “We’re training two new fillies this spring.” It’s the everyday way to point out a young mare without saying “young female horse” every time.
Meaning & Usage Examples
- Filly: A female horse, 3 years old or younger.
- Example: “The bay filly is already faster than the older colts.”
Common Context
You’ll hear “filly” most at horse races, in equestrian magazines, and on farms. Once she turns four, people usually start calling her a mare.
Is a filly the same as a mare?
No. A filly becomes a mare after her fourth birthday.
Can “filly” be used for other animals?
Only for horses. Other young females have different names—like heifer for cows.
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