well, I TRY TO keep them on 24/7 however, Cinni, our little princess LOVES to try to take Thunder's collar off .. i guess it is her way of saying that SHE does not like the color he has on... .. the only reason i know she did it is because came home and thunder's Collar was off and in the backyard chewed up ... then, a few days later we caught the little princess in the act when she was tugging on thunder's collar .... sooo, i guess you could say they stay on, unless Cinni does not Approve of the collar.