Research has found that there are many reasons for this, such as gender, how thick their coats are, and even their behavior. The swirls on the bum of the dogs are also called crowns, cowlicks, and whorls. Hair whorls and brain development are known to have an association with coat length, gender, thickness, origins, and even their behavior. Not all the swirls in the dog are the same. Sometimes they are simple and sometimes tufted. It diverges into a flat swirling pattern, and many times it converges from multiple directions to one point to form a tuft. The direction can be either anticlockwise or in a clockwise direction. The swirls are present at different places in the dogs, but they commonly have swirls on the bum, elbows, back of the legs, and chest. The direction is related to left and right paw preference.