The hardest breed to train is the English bulldog. It can be one of the most challenging pets to train, despite its small size. As a result, bulldogs are often labeled “difficult dogs” because they’re quite difficult to housebreak and train. They require more exercise than other breeds, and they’re also very energetic, requiring a lot of energy from their owners to keep them active. However, the English bulldog has loyal, loving personalities, making it easier for the owner to take care of. In addition, English bulldogs are extremely affectionate and loyal, and make good family pets.