Some scientists claim that dogs might be our relatives by blood. It sounds absolutely incredible, but there is some common sense in this crazy idea. The reasons these smart people find logical truly seem to be like that: they say dogs have much more feelings and emotions pretty similar to ours than apes or rats who have none. Besides lots of dog-headed people were painted on the walls of ancient caves discovered all over the world. Finally dogs are extremely clever - and perhaps this video might become the third and major reason to believe these clever guys!