Phantoms Cause any pet that is sitting to jump up and teleport to the player.

When the player is attacked by a Phantom in a close area next to any type of pet that is sitting, The pet will stand and teleport to the player, Note that the pet will not attack the Phantom just teleport to the player. This does not affect pets that are a certain distance away from the player. Can confirm this happens to parrots, cats, and wolves.