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.