I use a spray bottle, and it works, but keep in mind you have to start them out with it when they are young. All i do now is pick it up and show them and they lay down.I have six dogs and they all know when the bottle is picked up that it is time to be still. My pit is 15 weeks and she is already trained to it.

well I have found that sometimes when dogs get older, their needs are different, do you have new pets in the home in turn my get more attention then he does? Or sometimes if he has not been fixed that helps somewhat, dogs get depressed also, finding the source of why he is not happy.Maybe if you dont spend as much time with him can be the reason.