In a 3-1/2- or 4-quart slow cooker, stir together the barbecue sauce and cranberry sauce until combined. Stir in the wieners and/or sausages.
Cover and cook on low-heat setting for 4 to 5 hours or on high-heat setting for to 2 to 2-1/2 hours. Serve immediately or keep warm on low-heat setting for up to 2 hours. Serve with a slotted spoon or toothpicks.