Seriously why? The best attempt to explain Ursa Major's tail that I've read was that it got stretched out when Zeus pulled the animal to the heavens. I don't buy it. Why name a constellation after an animal if you have to change the animal to make it fit? It's weird that the bear is always depicted with a long tail, and with a little help from H.A. Rey, it's time to produce a more satisfying bit of constellation art. Let's draw!
Star screenshot from Stellarium
John Read's book with my illustrations: https://amzn.to/3u4woWY