Staffordshire Terrier
This breed is very strong and can easily become aggressive. They need to be trained in order to keep them from misbehaving. They’re known to be gentle with humans, but they still have a violent streak to watch out for.
Presa Canario
This breed has a bad reputation for not being fit to be a pet. These dogs were bred to be sheepherders on farms because of their size and demeanor. It’s capable of taking a human down if it so wishes.