20. Dogo Argentino

The breed was created in Argentina for hunting big animals including puma. Although these dogs are friendly with people, they are forbidden by law in the United Kingdom since 1991.

19. Boer Boel

Having its origins in South Africa, this mastiff dog breed was created to guard local farms and homes. They are extremely loyal, but they would protect their own family at all costs.

18. Gull Dong

Nicknamed the Pakistani Bull Dog, this type of dog is a mix between Gull Tarrier and Bully Kutta. It’s extremely strong and powerful, but it’s also very difficult to control and less loyal than other breeds.

17. Basenji

This hunting dog breed comes from South Africa. Although they are curious and affectuous, they don’t trust strangers. Also, this is the second least trainable dog breed in the world.

16. Saint Bernard

St. Bernard earned its popularity due to its abilities of saving people lost in the mountains. Originated in the Swiss Alps, it needs professional training to avoid being aggressive with strangers.

15. American Bulldog

The best words to describe this dog breed are muscles, strength and protection. Although they’re very good at protecting their home, their stubborness and self-confidence makes them hard to be trained and act on their own at times.

14. Great Dane

The Great Dane, or German Mastiff, is a large sized dog that can guard very well any given territory. Its hunting skills are so good that it can hunt even deer and wild boar.

13. Fila Brasiliero

Fila Brasiliero, or the Brasilian Mastiff, is a massive dog breed with much strength and aggresivity. However, it has quite a temper, which made many states worldwide ban it.

12. Perro del Presa Canario

This strong and agile dog breed needs to be well trained and accustomed to people ever since birth. However, even so, it’s very suspicious of people and may attack other dogs suddenly.

11. Akita Inu

This large dog breed first appeared in the Japanese mountains. It’s known for being very loyal and loving with their owners protecting them at all costs. At times, though, they can be very aggressive because they care a lot about their territory.

10. Boxer

Although they are not usually aggresive and can be raised to be friendly, these dogs may even kill people if they feel like it. They are extremely strong, resistance and have great reflexes.

9. Wolf Hybrid

This dog breed is a mix between the usual dog and a grey wolf. The genetic mix of instincts and qualities turn this strong breed into a very impredictable and dangerous one.

8. Chow Chow

Surprisingly enough, these beautiful dogs can be very dangerous unless they are trained very well. They are naturally inclined towards attacking strangers and are extremely protective. Chow Chow need to waste their energy daily, or else they become considerably more dangerous.

7. Doberman Pinscher

The main qualities of these dogs are loyalty and quick instincts. They will protect their masters at all costs and are naturally likely to attack other dogs. Their size and strength allows them to harm people to death if they are a danger to their owners.

6. Husky

Huskies are known for being adventurous and often used for sled dog racing. Although they can be trained to be loyal, they pose a threat to small beings and become dangerous when bored.

5. Alaskan Malamutes

Closely related to the Siberian Husky, this dog breed is perfect as a sports companion. However, when they get bored, these dogs can destroy everything around them and be disobedient. Also, they’re not very territorial, so they’re not good as watch dogs.

4. Rottweiler

One of the most powerful dog breeds, Rottweilers are among the best guarding animals. Lack of socialisation can lead to a dangeroud behavior as they become suspicious of anyone; also, they can kill if they feel it’s necessary due to their strength and agility.

3. German Sheperd

The main skills of this dog breed are loyalty, intelligence and agility. Usually used by the police in their missions, the German Sheperd is very protective and strong. However, it may become overprotective and can attack others without reason.

2. Pitbull

Initially created to hunt bears and bulls, Pitbull is among the strongest dog breeds in the world. Its basic instincts make it aggressive and dangerous and it can easily attack others.

1. Caucasian Ovcharka

Also known as Caucasian Sheperd, this dog breed is fearless and extremely strong. Its self-defense instincts make it extremely dangerous and may attack ferociously – also, it’s difficult to be trained.