The Collaborative International Dictionary of English v.0.48:

Garran \Gar"ran\, n. [Gael. garr['a]n, gearr['a]n, gelding, work
   horse, hack.] (Zool.)
   See Galloway. [Scot. garron or gerron. --Jamieson.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Galloway \Gal"lo*way\, n. (Zool.)
   A small horse of a breed raised at Galloway, Scotland; --
   called also garran, and garron.
   [1913 Webster]