27. French Mastiff
The English Mastiff is a giant breed, simply referred to as the Mastiff by the National Kennel Club. They require plenty of energy and regular exercise. These robust dogs possess strong protective instincts. Their size, large paws, and a bite force of 552 psi can pose a threat, but with proper care, they are often gentle and reliable family protectors. They are best suited for homes without small children due to their size.