The term "dangerous dog" refers to a canine that has been deemed potentially dangerous or aggressive by local authorities, and is often subjected to certain legal restrictions as a result. These dogs are typically identified through their behavior towards humans or other animals, and may be required to wear muzzles in public places, be kept on a leash at all times, and have special registration requirements. The phrase "dangerous dog" can also refer more broadly to any breed of dog that has been historically associated with aggression or violence towards humans, such as pit bulls or Rottweilers.