1. Most dogs are physically or behaviourally incapable of killing livestock.
2. Greeks thought dogs could foresee evil.
3. Dogs have always been credited with the power of sensing supernatural influences, and seeing ghosts, spirits, faeries or deities which are invisible to human eyes. In Wales only dogs could see the death-bringing hounds of Annwn; in ancient Greece the dogs were aware when Hecate was at a crossroads foretelling a death. Dogs are believed to be aware of the presence of ghosts, and their barking, whimpering or howling is often the first warning of supernatural occurrances.
4. When a dog howls in an otherwise silent night, it is said to be an omen of death, or at least of misfortune. A howling dog outside the house of a sick person was once thought to be an omen that they would die, especially if the dog was driven away and returned to howl again. A dog which gives a single howl, or three howls, and then falls silent is said to be marking a death that has just occurred nearby.
5. In Scotland, a strange dog coming to the house means a new friendship; in England, to meet a spotted or black and white dog on your way to a business appointment is lucky. Three white dogs seen together are considered lucky in some areas; black dogs are generally considered unlucky, especially if they cross a traveller's path or follow someone and refuse to be driven away. Fishermen traditionally regard dogs as unlucky and will not take one out in a boat, or mention the word 'dog' whilst at sea.