Tamed Wolves/Cats Teleporting when Leashed to a Fence

Step 1: Use a Lead on a tamed wolf or cat, then tie it to a fencepost, leaving the animal standing.
Step 2: Walk away from the fencepost until you reach a distance where the animal should teleport to your side.

Result: animal will teleport to your side, the Lead will break, and a Lead will drop on the ground beside the animal.