Many people have a misconception that dogs that look intimidating and aggressive, which is a wrong concept. Generally, the dogs that were developed for protection or guard purposes look intimidating. But there are many of these dogs, which are much less aggressive than Chihuahua or GSD, and even some are considered to be the one among most gentle and friendly breeds. Know the 15 such dogs that look scariest. Such as Cane Corso, Pitbull Terrier, Bully Kutta, Anerican Akita, Caucasian Shepherd, Kangal, Presa Canario, Tibetan Mastiffs and others.