In 'The Lammas Hireling', the quote "A Warlock, a cow with leather horns... muckle sorrow", this encompasses Freudian Psychoanalytical Theories of Eros & Thanatos, the "cow" symbolises fertility and the life force (Eros), whilst the "Horns" symbolises the malevolence, demonic & violent actions, inherent to the death force (Thanatos)