So far I've only used the spray. I primarly purchased the spray to help calm gizmo whenever I had to take him to the vet. I just sprayed once in the carrier a half hour before I left and it seems to have helped. He actually went in the carrier and laid down. Before, as soon as I picked up carrier he would just go crazy, this last time he was fairly calm. Gizmo is a pretty relaxed cat normally, at least in the house, so I figure the only time I'll probably use it is when I'm taking him somewhere.