9. Caucasian Ovcharka
These dogs are naturally suspicious of strangers and humans that they don’t know, so for that reason, if you are planning to own this dog, you need to train it immaculately.
The Caucasian Ovcharka was originally bred to protect livestock. The breed is known to be assertive, strong-willed and courageous. However, unless properly socialized and trained from an early age, these dogs can exhibit ferocious and unmanageable tendencies, as it will struggle to accept people it is unfamiliar with and view them as a threat.