Normally in Minecraft, tamed mobs like wolves and ocelots follow their owner when they get far enough away from them, and teleport to them whenever they get even further away. With this mod installed, this behavior only works when the mob in question is alert to the owner's presence. Which I would like to point out is very difficult to make happen intentionally, and even harder to maintain while moving. It also makes the teleportation behavior effectively never trigger, since once the owner is at the teleportation range, the mob in question has already completely lost track of the player. Tamed mobs should always be aware of their owner, no matter the distance or whether they can actually see them.