( CNN ) -- You 'll have to be doggedly clever to unlock Mike Linden 's new iPhone 5S . Linden , 23 , was fooling around with the fingerprint sensor on the iPhone he purchased Friday morning . He found it dull locking and unlocking it with his own finger , so he decided to find out what would happen if he programmed the front right paw of his pet Chihuahua , Hurley , into the gadget . How secure is your iPhone 5S fingerprint ? Much to his surprise , the pawprint did the job . `` I thought this is never going to work , and it did ! '' Linden told CNN iReport . `` The funniest thing is , it only works for the paw I programmed . It does n't work for the other three . '' Dogs are n't the only four-legged friends who can handle the sensor . TechCrunch found it has worked for cats , too . Linden , a musician in Burnsville , Minnesota , is an Apple fan : He was in line at Minnesota 's Mall of America at 4:45 a.m. to be among the first to get the new iPhone . The phone has a fingerprint sensor in its Home button for added security . Users must `` register '' their print with the device , after which they can unlock the phone by placing a finger or thumb on the button . But though he 's been tickled by the finger ( paw ? ) print sensor , Linden 's not too pleased with the particular phone he bought . The sound from the phone receiver is muffled and he suspects he 'll have to return it . When he does , Hurley might not be as cooperative . `` The more I do it the angrier he gets , '' Linden said . `` I 've tried all the paws now and he put up quite a fight to get the back ones on there . I have to give him a lot of treats . '' Hmm . Treats . Perhaps a new Apple marketing strategy ?
iReporter Mike Linden finds new iPhone fingerprint sensor software for his dog . Linden 's dog , Hurley , had paw programmed to detect the iPhone 5S . Hurley is n't too fond of his role , however -- ` ` the more I do it , the angrier he gets ''