As a Medical Procedure, It’s Critically Important
People have to do this in order to ensure that their dogs are in peak health. You know how dogs scoot about in cartoons dragging their butts on the ground? Because of their anal glands, dogs are able to accomplish this. Anal glands may need to be “suppressed” if your dog is licking itself excessively or emitting a particularly unpleasant odor from the area.
You should not transmit this process to your supervisor, even if you are a fellow pet lover who would understand. It’s possible he has some inside information.