Archaeological findings propose the evolution of the domestic dog goes back to the year 10,000 B.C. there be already tamed dogs; and in Denmark and Germany some primitive remainders have been found just now.
Answers: That would have been when Woof, an abandoned timber wolf pup be taken in by Ugg the caveman and fed on scraps of Terredactile meat until it be grown. Then Woof started paying Ugg back by helping him hunt. They became so successful at this that others in Ugg's community started adopt wolf pups of their own. This is where the beginnings of the ASPCA was formed. The Association of Sporting Pups of Cave Dwellers Annonomous.
Ugg's distant relatives are known now for their cool new fashion designs in footwear... they still own dogs.