I wouldnt have thought they'd need to know what you are using them for, when you phone about ingredients, just ask if they are medicated crumbs or not - that would be something you'd ask if you were buying it for chicken feed anyway. Having said that, I told them in Jollyes when I first started using them several years ago - and they werent at all bothered (although they thought I was a bit mad LOL!) but since then I know that some of the staff there who have cats, now use chick crumbs as litter.