Rawhide is the inner layer of cow or horse hides (skin). During manufacturing, the hides are cleaned and cut or ground. Then they're pressed into chewable dog treats of different shapes and sizes. To make them more appealing for dogs, some rawhide treats contain beef, chicken, or liver flavorings
how to feed
Hides are shipped to tanneries for processing where they are treated with either an ash-lye solution or a toxic recipe of sodium sulphide liming so that any fat or hair will be stripped from the hide. Hides are treated with hydrogen peroxide and/or bleach and the carcinogen FD&C Red 40, along with preservatives like sodium benzoate are used to give the rawhide the color and “appealing” look
Actual "raw hide" (raw animal skin) is an organ that can be very beneficial to dogs since its packed with nutrients! But its best to feed it unprocessed or air-dried. Real Dog Box offers pig skin and rolled cow skin which are raw (just air-dried) and make great for chews.