I have been looking for something to help me train my dogs better cause they have been acting up ad not listening to me and low and behold I found the magic trick. My little dog has a problem with barking at people when she sees them out of the window so when I got this whistle I couldn't wait for someone to walk by and when she started barking I blew the whistle and she immeditily stopped barking and kinda looked at me so I knew this was working I have now broke her of barking at every little thing or person who walks by . MY big dog was always at the sliding glass door and wouldn't stop messing up my blinds so when I seen her doing this I would blow the whistle and tell her no and it took a couple of times but it has been working as well . Thank god I found something that was able to help me train my dogs and keep my house in tact