You see it all the time with your dog; they turn in circles before they decide on a spot that’s just right for them to go number two. It turns out they are doing it for a reason. According to a study done by Czech University of Life Sciences, dogs are sensitive to small variations in the Earth’s magnetic field.

They are looking for the perfect spot to relax and do their business. The study shows dogs prefer a north-south axis to relieve themselves and try to avoid an east-west direction. Scientists say for the first time the study shows dogs are sensitive to small changes in polarity and predictable behavior can be measured according to the natural magnetic field. They also believe this study will help on animal studies in the future.