The wulver is a kind of werewolf that is exclusively part of the folklore of the Shetland Islands of Scotland. The wulver kept to itself and was not aggressive if left in peace. Unlike most 'werewolves' the Wulver is not a shapeshifter and is not nor was it ever a human being. It appears to be a sort of immortal spirit. Jessie Saxby, in Shetland Traditional Lore (Chapter 9), writes, "The Wulver was a creature like a man with a wolf's head. He had short brown hair all over him. His home was a cave dug out of the side of a steep knowe, half-way up a hill. He didn't molest folk if folk didn't molest him. He was fond of fishing, and had a small rock in the deep water which is known to this day as the 'Wulver's Stane'. There he would sit fishing sillaks and piltaks for hour after hour. He was reported to have frequently left a few fish on the window-sill of some poor body."
A similar un-hostile werewolf is the Faoladh from Irish folklore. The Faoladh was said to protect children and stand guard over wounded men.
Briggs, Katherine An Encyclopedia of Fairies Pantheon Books, New York.