Sooooo, adding a sled could be done in a couple of ways: 1. The sled could be a fixed rig to the armature of the wolf, effectively having no motion of its own and statically "dragged" by the action of the wolf animation. 2. You can re-rig the wolf and sled to a chariot animation. The wolf and sled would animate like a chariot, losing the "howl" and other distinct traits for this custom animation. It's up to you which you might prefer. The only additional problem would be an actual sled. Pictures, while nice, are not mesh . Do you have a referenced 3d model of a sled to use?