'Shetland pony' definitions:

Definition of 'Shetland pony'

(from WordNet)
noun
Breed of very small pony with long shaggy mane and tail

Definition of 'Shetland pony'

From: GCIDE
  • 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]