Could not find a rawhide recipe but did find a biscuit recipe. Hope this helps.

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HOMEMADE DOGGY-BAD BREATH MINT PARSLEY DOG BISCUITS

Here is a refreshing dog treat recipe your dog will love and you can smile about. This minty fresh breath treat will clear the air literally and help banish the bad breath monster. So, say "Good-bye" to bad breath and "Hello" to sweet smelling dog breath.

2 cups whole-wheat or brown rice flour
1 tbsp. activated charcoal*
3 tbsp. canola or vegetable oil
1 egg
2/3 cup milk (low fat or regular)
1/2 cup chopped fresh mint
1/2 cup chopped fresh parsley

Preheat your oven to 400 degrees F. Grease the baking sheet.

Combine flour and charcoal in the bowl. Stir in the egg and oil. Mix well. Add the milk. Mix well. Stir in the mint and parsley. Drop tablespoonfuls approximately 1 inch apart on the baking sheet.

Bake for 15 to 20 minutes or until golden brown. Cool thoroughly and refrigerate in airtight container for freshness.

*Charcoal powder, capsules or tablets can be found at most health food stores, as your local pet store. Charcoal helps absorb toxins that can cause chronic bad breath.

Source: Bestbully.com