I have a cat with crazy anxiety. He licks all of the fur off his belly and will wake us up every hour to scratch him for .5 seconds before he runs off. This worked well. The only thing that kept me from giving it 5 stars is the price. In order for me to cover my house I would need 6 diffusers and that's almost $200 initially plus the refills. I went with the collar and that thing has been a Godsend.