The Rottweiler, a strong and powerful working dog, unseated the tiny Shih Tzu for the coveted number 10 spot in this year’s list. The Rottweiler has grown in popularity over the years, steadily climbing from number 17 in 2006 to this year’s spot. While this breed may seem fierce at times, Rottweilers are intelligent, obedient animals that are great protectors. This is why they may be less than friendly with strangers, but playful and loving toward their families.