I don't know anything about that... I don't see how they could sell something thats poisonous... We used it on all three dogs and didnt have any problems. I only used it for a month though until they got rid of their fleas at where I work. I don't know if you mean stuff you can't use around cats maybe? We don't have cats so I don't know about that.. All I did was research a brand that had the IGR (growth regulator) that prevented eggs from hatching that I could find relatively cheap.