This stuff definitely works. Tried Adaptil first time round. It’s very expensive in comparison to Pet Remedy and is man-made. Pet Remedy is natural and so much more affordable. True – it stinks for the first couple of days but that wears off and you don’t notice it. Takes affect on nervous dogs immediately and has no negative side effects. My dog is an extremely nervous boy and this is the first time he has been chilled out. Would definitely recommend.