For still other dog breeds, the focus is on breeding a very strong dog with a high pain tolerance and an unstoppable work ethic. Working sled dogs, livestock guarding dogs, hunting dogs, police and military dogs all need to have a high tolerance for pain and overall physical discomfort..Top Most Dangerous Dog Breeds in the World Large, powerful dogs are very popular among dog owners and ins.utions worldwide. The ability to protect livestock, farms, homes, military and prisons is highly rewardable for the dog and extremely beneficial for the dog owner..The dogs listed below are commonly thought of as the most dangerous dog breeds in the world. Although small dogs can be more aggressive and some seem to enjoy biting ankles, these larger breeds can do a lot more damage if they attack..The Most Expensive Dog Breeds . Chow chow This dog breed is originally from China and it can fetch between $, and $,. They are so much expensive because they are truly a unique breed and their lion like appearance really make them a majestic animal..
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