Rawhides can also cause a blockage in the intestine. My vet says the rawhide that is crumbled then pressed together (can't think what it's called) won't cause blockages, but can still pose a choking hazard. I don't give any kind of rawhides to any of my dogs just to be safe.
Here's a site with some info on the hazards of rawhides:
http://www.bdnhumanesociety.com/rawhides.htm