2020-05-17T01:15:33ZFluxBBhttp://forum.jonas.tuxfamily.org/forum/viewtopic.php?id=15998The ultrasonic barking collars work by making a high pitched noise that is uncomfortable for dogs, who can only hear it.]]>http://forum.jonas.tuxfamily.org/forum/profile.php?id=635112020-05-17T01:15:33Zhttp://forum.jonas.tuxfamily.org/forum/viewtopic.php?pid=18630#p18630