The pendulum and my unconscious mind

The NLP trainer shared about using a pendulum to understand our unconscious mind. After calibrating the yes/no directions, I asked if I should groom my dogs personally instead of sending to the groomers. Guess what? The reply was yes! Indeed I had been toying with this idea, especially after Abby’s session :( The facilitator, Dr Billy Kueek explained that I may have picked up cues from both Uno and Abby that they are more relaxed being groomed by me than by a stranger. Hmmm….it is possible, afterall I have been grooming them for months.....but could it be that I am unconsciously ‘controlling’ the pendulum to give the desired reply, to justify the costs of buying the grooming equipments??