As Miss Hoppy is a mutt bunny - I mean a mixed breed, we don't know what her average life span would be. We suspect she may be a Netherland Dwarf/Rex mix, as she's bigger than an ND, but has the "fold" in her ears that they do, but her ears are bigger than an ND's ears typically are, and yet she's not as big as a Rex. Books all say bunnies live 5-8 years, but her specialist vet says a healthy bunny can live to be 15 in ideal circumstances. Miss Hoppy's regular vet calls her "the miracle bunny" because she is doing so well after her thymoma and radiation treatment for it last fall.