 In some stories , kitsune have difficulty hiding their tails when they take human form ; looking for the tail , perhaps when the fox gets drunk or careless , is a common method of discerning the creature 's true nature . A particularly devout individual may in some cases even be able to see through a fox 's disguise merely by <unk> them . Kitsune may also be exposed while in human form by their fear and hatred of dogs , and some become so <unk> by their presence that they revert to the form of a fox and flee . 
