A recent Appeals Court Decision, Commonwealth v. Fettes, 64 Mass.App.Ct. 917 (October 18, 2005) states "A dog can be a dangerous weapon. A dangerous weapon is 'any instrument or instrumentality so constructed or so used as to be likely to produce death or great bodily harm.' There can be little doubt that a dog . . . used for the purpose of intimidation or attack falls within this definition." The case is linked from both Law About Animals and Law About Weapons.