What is the most un-dangerous dog in world?

There is no such thing as an inherently "un-dangerous" dog as any behavior issues stem from genetics and training rather than the breed itself. It's important to choose any dog based on breed temperaments that best fit any individuals' experience level, preferences, and lifestyle and then socialize and train any dog for obedience and safety. For children-focused households, dogs with typically gentle temperaments including Golden Retrievers, Beagles, French Bulldogs, and Labradors would be preferred.