The Deer - White Horns (1974)

A boy, after reading about the tundra, deer and northern lights, decided to create a deer out of the snow. As a result, he got a beautiful animal that became alive at night under the shining stars. The boy was sorry that his unexpectedly acquired pet can melt, so he decided to go to distant lands, where there is constant cold. This should help save the life of the new friend.