Rawhide is very dangerous, because of the potential for swelling in the gastrointestinal tract. From Pete Safety
“Wedeking adds that dogs can easily choke on it when the original large rawhide object is chewed down to a smaller piece. “Choking is a hazard, and rawhide can cause gastric irritation when dogs chew on it often,” he says. Wedeking adds that gastric irritation can also cause vomiting and extreme discomfort in dogs. ‘Tests on imported pet products made from animal hides by UK health authorities revealed many carried the salmonella bug, a common cause of gastro-intestinal infections in humans.” “They found that one in three batches imported from Thailand and one in eight from China contained salmonellas that had survived processing and manufacturing”
One option I like instead are dried sweet potato treats. Uncooked beef marrow bones are OK too, if messy.