For years, cat owners in the know have been using Feliway to help curb various feline behavioral problems. Feliway is a natural substance that mimics feline facial pheromones and has been used to deal with many stress-related behaviors, such as marking, loss of appetite, and scratching. Previously, Feliway came only in a spray bottle. But now, Comfort Zone with Feliway works much like a plug-in room deodorizer -- only instead of dispensing fragrance, it dispenses Feliway. You just put the Comfort Zone plug-in in a room where your cat is marking. If you're using it for a problem other than marking, just put it in the room where the cat spends most of his time. And don't worry about the scent; Feliway is completely odorless to humans.