When we have given rawhide bones, I only allow the dogs to have them for short increments of time - no more than 20 minutes - so that they only gnaw on the ends a little. And I emphasize that I am always right by them, watching. Never, ever, let Cookie chew a rawhide unsupervised.
Logan's right - there are lots of things that Cookie could chew on that are safer for her!
I only use rawhides because: 1) my dogs are finicky about what they chew; 2) one of my dogs has a cracked tooth, and our vet told us that dogs shouldn't ever chew on hard nylabones, bones, or hooves; and 3) greyhounds tend to get really yucky teeth, and I want them to have the chance to chew on something that will help to keep their teeth cleaner.
There's lots of things out there that Cookie can chew on if she's not a very aggressive chewer. My four dogs are all very aggressive chewers, and that's why they can't chew on hard things. Maybe non-aggressive chewers can chew on hard bones??? Ask your vet!
There's so much variety in the things you can give you dog to chew on. If you don't have any big pet stores near you, you can order toys from www.petsmart.com or www.dogtoys.com or many other websites.
Hope you find something good for Cookie to chew on!