MG_8697A well made rawhide should have some flexibility when twisted and should be made in North America to reduce the amounts of added chemicals, such as formaldehyde. Some rawhides have been washed in formaldehyde or bleached with titanium oxide (to make them white), so use caution when selecting a chew. Rawhide poses a choking hazard and should never be left with your dog when he is unsupervised.