15. American Bulldog
The American Bulldog was bred for guarding, farm work, and fighting. When raised in a loving environment, they can be friendly, social, and very devoted. However, without proper training and attention, they may develop temperamental traits. Training is essential for a happy family life with this breed. American Bulldogs are strong and muscular and could unintentionally harm children or small pets due to their size. They must learn to understand their own strength.