2. Rottweiler
Rottweilers are a medium sized domestic dog breed, which was originally bred to herd livestock and pull carts. They are used as search dogs, guide dogs and even as police dogs. They are one of the best guard dogs in the world. They were bred to be one of them and this is the reason why they are still fearless and one of the strongest dog breeds. Training is very important to keep a Rottweiler’s temperament in control, if not trained properly they can be ferocious creatures. Their social skill also depends upon their training. Rottweilers are very protective of their owners and they can be aggressive other strange people. They are extremely intelligent and with proper training they will be calm and awesome. They are good by nature, but bad training can turn them aggressive.
3. St. Bernard
St. Bernards are working dogs originally from Northern Italy and the Swiss Alps. They were bred to work as a rescue dog. The St. Bernard is a very large breed of dogs. They are enormous in size, the tales of their rescue missions in Alps are widely known and this is one of the reasons why they are famous. They are well known for their calmness. They have a friendly nature and are very patient when they are playing with children. St. Bernards are very large and the only threat to small children is being knocked over due to its large size. They are fearful and powerful. They are trained for rescue missions in the Alps and it is because they are one of the strongest dog breeds in the world. They get socialized easily and they are very loyal.
St. Bernards are giant dogs and they weigh between 140–260 lb (65–120 kg), but sometimes they can reach up to 310 lb (140 kg). In terms of height, they can reach 28–35 inch (70–90 cm). This is pretty big in terms of a dog breed.
4. Siberian Husky
Siberian Husky is a dense coat, medium sized dog breed that belongs to the Spitz family. They were initially used as sled dogs; they are powerful and are used to living in extremely cold conditions. They can pull heavy loads through extreme conditions in the environment of Siberia. They live in one of the toughest weather conditions and it makes them strong and brave. They are very intelligent and gentle by nature until they see any danger. Giving proper training to a Siberian Husky will result in it being calm and less aggressive. They are highly energetic and need daily training and exercise. They are very patient and gentle with kids. Siberian Huskies are used by “Chukchi People” to look after their kids.
They have a very muscular body with a double coat of hairs, the weight in male Siberian Husky is between 45–60 pounds (20–27 kg) and in female it varies from 35–50 pounds (16–23 kg). Siberian Huskies are medium in size, their height goes from 21–24 inches (53–61 cm) for males and in females it is 20–22 inch (51–56 cm). The average lifespan of a Siberian Husky is 12 years.
5. 
The Kangal is a livestock guardian dog, they are large in size. Kangals originated from Turkey. They were used as guarding dogs to protect the flock of sheep from predators like wolves, jackals and bears. With this protective guarding instinct, they are very powerful and strong. But when it comes to their temperament towards people, they are very gentle, calm and loyal towards their owner. They are very protective and gentle with little kids; they understand them and keep their calm while playing with little kids. They are a very well socialized and intelligent breed of dog.
Kangals can be large/medium in size, they are not as gigantic as Great Danes and St. Bernards but they are still big. The height in Kangals can go up to31 inch(78 cm) with minimum height of 65 cm (26 inch). The weight in male Kangals is between 110–140 lb (50–63 kg) and in female it is 90–120lb (41–54 kg).