I've used the diffusers and can definitely see a difference in behavior. I don't consider it a miracle cure, but it does help. I started using them when I introduced Holly into the house. When I didn't pay much attention to it, but would definitely notice a difference in behavior, then I'd look and see and sure enough it was empty. I stopped using it when it ran out and there was no change in behavior.
It was recommended to me by someone at the shelter where I volunteered. She said it made a big difference there, where they have many, many cats all loose in a room.
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Holly, Misty & their friend, Jake, the dog.
Onyx, Callie May, Maggie & Kobi forever in my heart.
Yes, I know I need a new signature pic...someday...