I tried them for 3 days as i had work outside the house to be done and to be honest did not really work they wre as giddy as ever and the bark is the worst as i have two GSDs and if one starts to be over excited the othe one follows. Now i gave them 3 days before the work people come and unless i gave them wrong i was not totally happy with them sorry to say this but i moght try them again as it was the first time they had them.