DCHP-1 Online
shag pony West 
n. originally, a wild pony, a mustang; later generalized in the West as a name for any horse, often with a derogatory or contemptuous connotation.
See also: cayuse ((n.)) shaganappi pony
- 1918 . . . every morning, after sucking a couple of eggs for a breakfast, E. A. Partridge took to loping across the prairie on a "Shag" pony.
- 1918 . . . every morning, after sucking a couple of eggs for a breakfast, E. A. Partridge took to loping across the prairie on a "Shag" pony.