After my oldest cat 3 "experts" had passed away, it was made with the "house of peace" in the cat room. As all cats have different age structures, it suddenly went off with all sorts scratched chairs, wallpaper, etc., and it was argued tidy. Food intake and the Katzenclo were a problem. On the advice of my vet I resorted to "Feliway". SILENCE! All problems subsided quickly, even if "Feliway" is not just at a bargain price. The four-legged friends along again. When this occurs, or settling in apartment moving this stuff is really recommended! How long the "hormone - time - bombing" unfolds its effect and is beneficial to health, but I still need to clarify ....