noun
1. usually capitalized O&E&S : an English breed of medium-sized sheep and cattle dogs believed to trace back to the Roman occupation of the British Isles, having no tail or a very short one, a square large skull, nose tapered but blunt-ended, body short and compact with deep brisket and well-sprung ribs, forelegs straight, and hind legs well-muscled, being in length and height from about 21 to 26 inches each, and having a profuse, shaggy, blue-gray and white coat that often obscures the eyes and hangs from the body almost to the ground
2. usually capitalized O&E, sometimes capitalized S : a dog of the Old English Sheepdog breed — called also bobtail
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Old English sheepdog
]