- a horse or pony used in herding cattle.
Origin of stock horse
First recorded in 1860–65
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for stock horse
Once I stopped to look at Jim: I just sat back and the mare 'propped'—she'd been a stock-horse, and was used to 'cutting-out'.Joe Wilson and His Mates