You might see ponies at a children's birthday party or at a farm. They are often smaller than regular horses and have a cute, fluffy appearance that makes them popular for riding lessons or just petting. Some people keep ponies as pets, while others use them for work like packing supplies into the mountains.
How common is "pony"?
Word pony is considered uncommon in modern English. It appears most frequently in fiction texts and less often in other writings.
Definitions
noun
A small horse; specifically, any of several small breeds of horse under 14.2 hands at the withers.
(endearing) A horse of any size.
a contraption built like a mount, strong enough to support one's weight
(regional) A small serving of an alcoholic beverage, especially beer.
Example: 1879, “Some Queer Interviews: Interview with a Pony of Beer”, Puck, Vol. 5–6, p. 435
(Australia, New South Wales, Victoria, Western Australia) A serving of 140 millilitres of beer (formerly 5 fl oz); a quarter pint.
(UK, slang) Twenty-five pounds (money).
(US, slang) A translation used as a study aid; loosely, a crib, a cheat-sheet.
(slang) A ponytail hairstyle.
(automotive, slang) One horsepower.
Example: How many ponies are under the hood?
(preceded by definite article) A dance from the 1960s in which the dancer mimics the high-stepping prance of a pony.
(slang) A chorus girl of small stature.
(slang, derogatory, video games) Ellipsis of Sony pony.