2. Rottweilers
Rottweilers were once used to pull meat wagons in Germany, and this strength is a good part of the reason why they are dangerous. Indeed, rottweilers were responsible for three of the 38 U.S. dog-bite fatalities in 2012, with their sheer brute force making a bite from them much deadlier than one from a smaller, less powerful dog. However, violence in rottweilers is usually a sign of bad upbringings.
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