Source : Webster's Revised Unabridged Dictionary (1913)

Clydesdale terrier \Clydesdale terrier\
   One of a breed of small silky-haired terriers related to, but
   smaller than, the Skye terrier, having smaller and perfectly
   erect ears.

Source : WordNet®

Clydesdale terrier
     n : selectively bred small Skye terrier with erect ears and a
         long silky coat