When mobs with loyalty qualifiers look at a pet, they decide whether or not to attack based on the loyalty of the pet's master. Basically there are tags on your pet that say it is a pet and who its master is and then it just kind of looks you up.
You might want to check your loyalty and see if it's good with the Bane Chosen. Since for every point of loyalty you gain you lose 3 from the other side, if you are not careful you can end up with negative loyalty to both sides.
Check your loyalty and then let me know if there is still a problem.