5. Fila Brasileiro
Aka the Brazilian Mastiff, are one of the largest breeds of herding dogs. This particular breed originated in Brazil makes excellent guard dogs but requires experienced owners. Very aggressive and protective, these dogs are feared due to their uncontrollable behavior and many instances of fatalities caused by their attacks have been reported.
4. German Shepherd
German Shepherds can react on great speed and are extremely focused towards taking the danger down, they can cause fatal damage. A breed of dogs that originated from Germany, the German Shepherd can weigh as much as 70 to 100 lbs. Known for being intelligent, confident, alert, vigilant, and fearless; the police use them for their K-9 units. Their aggressive nature can be somewhat toned down by appropriate training, socialization and affection.
Rottweilers are a powerful breed with well-developed genetic herding and guarding instincts. As with any breed, potentially dangerous behavior in Rottweilers usually results from irresponsible ownership, abuse, neglect, or lack of socialization and training. Nevertheless, the Rottweiler’s strength is something that should not be overlooked. Rottweilers have one of the worst tempers, and are also, considered unsuitable family dogs, especially for families where the owner is an amateur, without a calm and assertive nature
2. Pit Bull
The term ‘pit bull’ encompasses certain breeds of dog from the American Pit Bull Terrier, the Staffordshire bull terrier, the American Staffordshire terrier, and the American Bulldog. Originally bred for baiting bulls and bears the majority of their breeds were also used for dog fighting in numerous parts of the world and is considered as the most dangerous dog in America.
Pit Bulls are fighter dogs and they will enthusiastically go after their task until completed. They have a very powerful jaw and bite and are well-known to not release their bite so easily. Therefore, they should be trained and socialized from an early age in order to avoid unnecessary dangerous situations.
1. Caucasian Shepherd
This dog can grow very large, minimum of 50kg or 110 lb. for an adult male, life span average of 10-12 years. The breed originated from Russia and other European countries, originally used as guard dog for protecting livestock in mountain regions, these dogs are even feared by some popular wild predators such as wolves.
The typical Caucasian Ovcharka is assertive, strong-willed and courageous. However, unless properly socialized and trained, the Caucasian Shepherd may exhibit ferocious and unmanageable tendencies since it does not accept people it does not know and has a powerful urge to defend.