I also remember a post about rawhide a while ago. Just in case you can't find it, I think I mentioned in that post that rawhide is actually very unhealthy for not only hedgehogs but dogs too. They use bleach to give the rawhide that white colour and it can make dogs really sick. Even supposedly "natural" rawhide can be dangerous. You have to be really careful with food and treats for dogs and cats because it is not as regulated as human food so many dangerous ingredients and chemicals can be found in some treats and food.
A note for dogs, though, if you want to give your dog any time of rawhide for their chewing needs, bone marrow is the best way to go. Lots of butchers will actually give away bone marrow for free or for a few cents each or something really worth it. Bone marrow doesn't splinter and is completely healthy and okay for dogs to eat.