22. Known for their large egg shaped heads, Bull Terriers are exceptionally strong dogs with a #1 ranking in pound-for-pound lean muscle tissue. Though not particularly aggressive, the breed is known to have a strong “prey drive” which makes the Bull Terrier a dangerous dog towards smaller animals. (Also Known As Chico From Friday 2 ) 18.The Gull Dong (also known as the Pakistani Bull Dog) is a cross breed between the Gull Tarrier and the Bully Kutta. Extremely strong and powerful, the Dong was specifically bred as a fighting dog and is known to be very aggressive and difficult to control. 8.Though they seem to be distant and independent, this breed of dogs requires staunch attention from their owners if they do not want them to grow aggressive and ill- bred. Originally from China, the 50 to 70 lbs Chow Chow can also be referred as Songshi Quan or ‘puffy-lion dog.’ This dog has discernment skills against strangers and can be fiercely protective of their owners. Consider as high-risks dogs, they are considered as ‘unacceptable’ and may require insurance due to 238 fatalities from dog bites from 1979 to 1998. Though they can be housed in apartments, they need daily physical activities and exercises so as not to become dangerous as pets. 1.The Caucasian Ovcharka also known as the Caucasian Shepherd, was bred to protect livestock. The typical Caucasian Ovtcharka is assertive, strong-willed and courageous. However, unless properly socialized and trained, the Caucasian Shepherd may exhibit ferocious and unmanageable tendencies since it does not accept people it does not know and has a powerful urge to defend.