Montana Ordinance Requires Insurance for ‘Aggressive’ Dogs July 7, 2010 The White Sulphur Springs, Mont., city council has passed an insurance requirement for the owners of certain breeds of dogs with reputations for aggressive behaviors. The ordinance requires owners of pit bulls, Doberman pinschers and Rottweilers to purchase $500,000 in liability insurance, regardless of whether the animal has shown aggressive behavior. Owners of other dogs would be subject to the insurance requirement if their animal bites a person or acts aggressively without provocation. [...]