Shetland pony

from WordNet (r) 3.0 (2006)

Shetland pony
    n 1: breed of very small pony with long shaggy mane and tail

from The Collaborative International Dictionary of English v.0.48

Shetland pony \Shet"land po"ny\
   One of a small, hardy breed of horses, with long mane and
   tail, which originated in the Shetland Islands; a sheltie.
   [1913 Webster]