Rawhides are very dangerous, they can choke your dog if he swallows a big enough piece. They're also preserved with some pretty nasty stuff, and since you're so picky about his treats I don't think you want those things in him.
There's a rawhide-like treat I plan on getting for my girls whenever my little brain gets around to it, it's called Sam's Yams. They have the teeth-cleaning benefits of rawhide but have no bad ingredients and are much safer than rawhide. They're just dried sweet potatoes, I don't think there are any other ingredients.
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Kadee Sedtal
"I wish I had a dollar for every time I spent a dollar, because then, yahoo! I'd have all my money back." -Jack Handey