I don't know too much, but from what I've heard is that people can still be allergic to them. Because it's not the hair people are allergic too, it's the saliva and since they still clean themselves they still get the saliva on their bodies. I've heard that some people who are allergic are ok and some still have problems. And I think they need to be cleaned with a damp cloth every so often to keep their skin from getting too oily.