The scariest dog breeds are those historically used for guarding work or dog fighting.
Aggressive behaviour in dogs can include biting, snapping attacks, barking, and growling.
I have put this list of the 23 scariest dog breeds with a fierce reputation.
#23 German Shepherd
German Shepherds get incredibly aggressive and scary if you’re not on their team.
The GSD’s temperament means that it excels as a police/military dog and guard dog.
In 2025, a Collier County Sheriff’s deputy shot a German Shepherd after an aggressive attack.
The dog died from its injuries.
#22 Japanese Akita
It was bred in Japan for its protective nature. The Akita has aggressive tendencies toward other dogs. It can react angrily if disturbed while eating. They are not a breed for the inexperienced dog owner.
Note – a well-bred and socialized Japanese Akita should not be aggressive to people.
#21 Doberman Pinscher
The Doberman Pinscher has a reputation as an aggressive breed, even a scary one. Doberman Pinschers definitely have the ability to be a very effective guard dog, as they are historically bred specifically to be intimidating and aggressive.
#20 Alabai
The alabai dog is a large (males can reach 90 kg) and territorial breed used for guarding livestock. Its territorial nature can become problematic if not socialized or trained.
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#19 American Bulldog
In 2018, the American bulldog was the fourth most dangerous dog breed in the US, according to Forbes.
#18 Gull Dong
The Gull Dong is famous for being one of the most aggressive and vicious dogs with a tendency towards dominant behavior. This dog is not for the novice owner
#17 Kangal
The Turkish breed was initially bred to protect livestock from bears and wolves. Kangals can look scary ( a male can easily reach 70 kg), but they (usually) only bite predatory animals. Its average bite force is somewhere between 250 and 400 PSI.
#16 Presa Canario
The Presa Canario is an aggressive and dangerous beast that can reach over 130 pounds. They are not recommended for homes with small children or pets.
#15 Cane Corso
Cane Corso is an Italian dog breed known as a war dog and guard dog. If you haven’t socialized your Cane Corso properly from a young age, this screams problem.
#14 Fila Brasileiro
They are extremely dangerous dogs. And scary. Fila Brasileirocan become aggressive towards people and other animals. Lifelong training and socialization are a must.
#13 Staffordshire Bull Terrier
Staffordshire Bull Terrier is mostly dangerous because of its capacity to cause serious damage when it attacks. Their reputation as a vicious and aggressive breed preceded them.
At the end of 2025, a man in Oxford was bitten and hospitalised by a Staffie in a dangerous dog attack.
#12 Tosa Inu
The Japanese Mastiff is a dog breed of Japanese origin that was bred to become a fighting dog. Ownership is restricted in some countries as a dangerous breed.
#11 Bandog
It was primarily bred for fighting and guarding property. Bandogs have strong protective instincts that can lead to aggressive behavior.
#10 Neapolitan Mastiff
The Neapolitan Mastiff is a giant working dog from Italy that is aggressive with people they don’t know. Males are known to be very dominant and confrontational.
#9 Dogo Argentino
Dogo Argentinos are descendants of the now extinct fighting dog of Corboda, and were bred to hunt big game like mountain lions. They are easily considered one of the more aggressive dogs out there. This breed needs rigorous training to tame its aggressive behaviour.
#8 American Pit Bull Terrier
Over 50% of dog bite fatalities in the US are caused by pit bulls.
#7 Tibetan Mastiff
The Tibetan Mastiff is the biggest dog in the world and may seem quite intimidating.
#6 Wolfdog
Wolf-dog hybrids combine domestic dog and wolf genetics. Hybrids have stronger territorial instincts and are likely to be dangerous and prone to attack humans.
#5 Bucovina Shepherd
The Bucovina Shepherd is a strong guarding dog that can weigh 90 kg. It has been known to fight bears to the death.
#4 Karelian Bear Dog
Karelian Bear Dogs are aggressive to other animals and have a powerful defense instinct.
#3 Rottweiler
Rottweilers’ large head and imposing body made them popular guard dogs during the 20th century. It is a breed of dog that has the potential to be aggressive. Between 2005 and 2017, Rottweilers were responsible for 45 human deaths.
#2 Caucasian Shepherd
The Caucasian Shepherd is a powerful breed native to the Caucasus. These dogs are bred to kill wolves and protect sheep. See how scary this 1-year-old Caucasian is.
#1 Cordoba Fighting Dog (extinct)
The Cordoba Fighting Dog was a dog breed from Argentina that was bred and trained to fight to the death. The breed became so aggressive that it was very difficult to breed them since they would rather fight than mate. Their aggressive temperament ultimately led to the breed’s extinction.