It's starting to sound like Cincy might have some sort of obstruction. When my Jingles was vomiting continually like Cincy is, X-rays showed multiple foreign objects! The vet kept her for a couple of days, checking her poop, and finally the culprits were passed. If Cincy is eating large chunks of the rawhide, not chewing they well, that might be the problem. I think having her belly x-rayed would be a good idea, ruling out a lot of possible causes. Hugs for sweet Cincy...Please let us know how the visit went. We'll be keeping all things crossed until we hear from you.