Think of dangerous beasts and what comes to mind.

Sharks, crocodiles, clowns.

Well, believe it or not, man's best friend tops the list.

Yep.

Dogs are the fourth deadliest species on the planet

and are responsible for a staggering 35,000 fatalities worldwide per year.

And to no one's surprise, humans have bred some to be more dangerous than others, purely for their own gains.

So from brutish bulldogs to destructive Dobermans, these are some of the most aggressive guard dogs in the world.

You're listening. You're listening. You're listening.

You're listening.

You're listening.

You're be amazed.

I guess they had a truly pausing gladiator of a dog.

A little over 2,000 years ago, Roman soldiers were marching through Northern Europe like they owned the place.

I guess they had a lot of gall.

Joke for the history buffs out there.

Anyway, accompanying the troops was the Roman Mastiff, also known as the Melossus, a legendarily muscular dog used for farming and battle. The Romans campaign path led through what is now Rottweil in southwest Germany.

As the Centurians passed, many of these massive Mastiffs were left behind and then adopted by the locals.

The Mastiffs got to know the local country sheep dogs into Midlea and the Rottweiler was born.

Modern Rottweilers are considered large, strong dogs measuring 27 inches and weighing up to 110 pounds.

That's six times heavier than smaller dogs like Daxons.

Its spectacular size means a specially trained dog can pull about a thousand pounds,

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