I decided to switch my ferrets after reading on the holistic ferret forum for awhile and after my first ferret was diagnosed with insulinoma, a disease with a strong link to carbs in their diet. HFF mentors people through switching their ferrets since they have to be convinced meat is food in most cases. I originally switched a group of four, three have passed on over the years and I took in a new male about a year ago and switched him right off. Mine eat a lot of whole prey, mice and quail mostly right now but also rabbit, rats, guinea pigs. Plus just about anything else, chicken, turkey, grouse, duck, lamb, goat, pork, venison, beef.