I have a one and a half year old great dane.He is a hundred and fifty five pounds.He is vibration collar trained, also crate trained if needed to leave the home for a little bit.He does mind with the collar and the remote.He minds for the most part without it.Sometimes you do have to vibrate it.I never really have to shock it.So you don't have to worry about that.I have a sixteen year old boxer as well.He's decrepit.He has to go when he gets up.He has to go right then he's not a problem.He doesn't cause any trouble.He's too old too, but I work at amazon.Wednesday through saturday, ten hour shifts, it is not shift from six p m 25 a m.I do not have a sitter for that.And I do not have a home at the moment.I pretty much sat my sister's so I need to find a sitter.Please.