They are not too good for dogs. The higher end pet store in town won't even sell them. Once in a very blue moon I let the dogs have them and only USA made. Most of them are imported and there have been problems with dogs contracting illnesses from the curing process and something involving milk. Sorry I can't be more specific. I stopped paying attention to that when I stopped using them.
Other reasons: My male Riley would eat the giant ones that were the size of my arm in like 20 mins-they were like crack. He would also try to remove the face of anyone that came within 20 feet of him while he had one... only with rawhide. Daisy and Doc will beat the living snot out of each other over them....again only over rawhide. IMO, and many stories, dogs just get wierd over them. They are an extreme rarity at my house. Last but not least you can't get the mushy slimy rawhide stuff out of anything once it has dried like cement.