Rawhide products are not regulated or inspected by the Food & Drug Administration. That means we do not know FOR SURE what is in or on these treats. Many rawhide treats are made in other countries that have even fewer regulations than us. Tests have shown that a lot of rawhide carries salmonella bacteria and ever worse, arsenic. Sometimes harsh chemicals like bleach and lye, are used to clean the hair and tissue from the hide. They may leave a residue behind.
Rawhide can swell up and get stuck in the stomach, intestines, or esophagus. Believe it or not, your dog can not digest rawhide. If it irritates the gastrointestinal tract it may cause diarrhea and vomiting.
It's better to give your dog clean, safe, and digestible treats. Wash your hands with soap after handling.