It is important to note that any dog can bite and cause personal injuries, and while the environment of upbringing has the most influence on the behavior of a dog, certain breeds of dogs are regarded as inherently dangerous. Based on research, some dogs are considered more dangerous than others. Here are the top 5 most dangerous dog breeds according to DogBite.org and other sources:

1. Pitbull: Pit bulls are considered the most dangerous dog breed, responsible for the majority of fatal dog attacks in the United States. They are a very aggressive breed and have been known to attack and kill people.

2. Rottweiler: Rottweilers are known for their muscular bodies and were originally bred to drive cattle. They are the second most dangerous dog breed and accounted for 2 of 31 dog-related fatalities in the year 2016.

3. German Shepherd: German Shepherds were originally bred for herding and guarding sheep, but they’re now often used as police dogs, guard dogs, and service animals. They are one of the most popular dog breeds in the world, and they’re also one of the most dangerous.

4. American Pit Bull Terrier: The American Pit Bull Terrier is considered one of the most dangerous dog breeds – both in the U.S. and internationally. They are a very aggressive breed and have been known to attack and kill people.

5. Chow-Chow: Chow-Chows are known for their blue-black tongues and thick fur. They are a very aggressive breed and have been known to attack and kill people.

It is important to note that while these breeds are considered more dangerous, it is not a guarantee that they will attack or bite. It is also important to remember that any dog can be dangerous if not properly trained and socialized.