10. Doberman Pinscher

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Frequently featured in film and TV as a vicious deterrent, Dobermans are often considered high-risk dogs in terms of behavior. A propensity towards dominance and territorialism can also spark concerns as well.

If provoked, they can become aggressive and attack.

Plus, they are incredibly loyal – which makes them great guard dogs. This, combined with their ferocity, explains why they are often used in police and military operations.

Of course, these traits also lend themselves to justifying why these dogs might increase your insurance premiums.