2020-05-16T21:15:21ZFluxBBhttp://forum.jonas.tuxfamily.org/forum/viewtopic.php?id=15922The 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=635012020-05-16T21:15:21Zhttp://forum.jonas.tuxfamily.org/forum/viewtopic.php?pid=18554#p18554