The article examines the use of dogs as weapons during historical battles. Particular attention is given to the use of dogs in the military history of Scotland and Ireland. Evidence exists from early Irish literature in the seventh or eighth century epic "Táin Bó Cuailnge" which is translated "Cattle Raid of Cooley." The Celtic poem "Exile of the Sons of Uisliu" discusses the importance of dogs in the everyday lives of the ancient Irish. An example of a dog used in combat is found in the "Story of MacDotho's Pig"