Pony (noun)

1. A small horse.
2. A horse of a small breed or a horse that is small for its breed.

Origin:

Middle english: from old french poulenet, diminutive of poulain "foal", from latin pullus "young animal".

Examples:

1. She rides a pony on competitions.
2. The children were riding ponies at the fair.
3. He had a collection of ponies in his stable.
4. Pony is a small horse.
5. She owns a Shetland pony.