Does anybody know what Ilius is? My sister's rabbit got it (a toxic reaction to too much grain) and now the vet wants her on a hay-only diet. The problem I have with that is hay isn't as nutritious as it used to be and grain or other supplements are probably needed. He even said no fruit/vegetables. He gave us a packet on nutrition, but can I really cut off all other feed even if in smaller doses than before? She's also lost a lot of weight.