pony

As nouns the difference between pony and shelty

is that pony is pony (horse) or pony can be bangs, fringe (haircut ) while shelty is a shetland pony; any small pony.

As nouns the difference between pony and ponygirl

is that pony is pony (horse) or pony can be bangs, fringe (haircut ) while ponygirl is (bdsm) a woman, usually submissive, who takes the role of a pony; this typically includes wearing tack such as a bridle and bit.