Version: Unreal World 3.63, Linux/Steam build, unmodded
What happens: I have a tame reindeer doe that I tied to a tree. When I came back, it was sleeping. I untied it from the tree, expecting it to wake up, but instead it remained asleep. It continues to move with me as per normal on the leash, but it's shown as sleeping, both as a graphic and when inspected with F3.
What's expected: Reindeer wake up when their leashes are tugged on, or refuse to move while sleeping.