Blood Dogs/Scots Hounds

The Blood Dogs are mythical creatures from Scotland and Northern England. They have grey bodies, and red eyes, and leave no mark on the ground to indicate their presence. Their baying is thought to sound like the wind. They’re believed to haunt battlefields and lick up the blood of fallen soldiers, digging through the dirt for soaked-up blood and unburied corpses. In Scotland, they only feed on the blood of English people and are thought to be the ghosts of the hunting dogs belonging to Bonny Prince Charlie. They form out of morning mist, the day after a large battle. 

Citations:

Maberry, Jonathan. Vampire Universe: The Dark World of Supernatural Beings That Haunt Us, Hunt Us, and Hunger for Us. United States, Kensington Publishing Corporation, 2006.