My Nepalese dog must not be an animal; because she stretches all the time.....not against her will either.
Here is a playlist of animals stretching.
https://www.youtube.com/watch?v=4OyzsmJE0Y0
My favourite is a chipmunk doing the deed. https://www.youtube.com/watch?v=LjIuKKmBrTI
EDIT:
Said actual cute stretching playlist: https://www.youtube.com/watch?v=4OyzsmJE0Y0&list=PLycYZfnbK0...