Well, it takes a while for my 3 almost 14 yr old "kitties*  2 brothers and their sister!  It's taken them a while to come around to the new item I've gotten, but they are warming up to it when they know I can't seem them.  they aren't to crazy about the noise through the tunnel, so maybe an option to come … one with "crunchy & 1 without ! …  That's why the 4 star.....