My dog has been through teething and she's 6 and a half months old. she will sit and stay but runs off with the bumper. I am extremly fed up with this crap. One day she's good and the next she isn't. And the whole week hasn't been good. The doctor says she may be coming into heat soon and could this affect why she's doing this? Sometimes she won't even pick up the bumper and if she does she grabs it by the throw rope. I'm having the hardest time please help.