The myth of dog constellation.

There is a goddess named Crystal. She is gentle and beautiful. Zeus likes her very much. After various pursuits, she gave birth to a son named Arcaz. Hera, the jealous queen, flew into a rage when she learned about it. She turned Crystal into a big bear and rushed into the forest. Arcaz, who lost his mother when he was a child, became a very good hunter when he grew up, but he didn't know what happened to his mother. One day, Hera let fate arrange for Arcaz to meet his mother bear in the forest. When her mother saw her son who had been missing for many years, she was so excited that she forgot that she had become a big bear and couldn't help running to arcas. Arcaz thought the bear was going to hurt him, so he immediately raised an arrow to shoot it. Just when the big mistake of killing his mother was about to be caused, Zeus broke through the knot of guilt and timidity, and turned Arcaz into a little bear, and put it in the sky into a little bear, so that their mother and son could be together forever. But Tianhou still didn't give up. She asked to take two hounds after the bear and the bear. At any time, the hound always follows the two bears and faithfully entertains the mission entrusted by Hera.

The other is that Jacques Dorothy, the guardian of the bear, was sent by Zeus to protect their mother and son (Ursa major and Ursa minor).