A violent thug butchered his elderly father's dog with a samurai sword after flying into a fury on Christmas Day. Brian Coote, 37, has been handed a prison sentence after also launching attacks on two police officers following his arrest. Coote spent the previous Christmas Eve boozing heavily. Upon waking on Christmas morning, his dad Alan offered him a cup of tea. Police stated he then 'grip his father by arms'. Alan and his 'loyal and faithful companion', his dog Max, fled the scene and