About two weeks ago Sid stopped eating his hay. He has been eating his pellets just fine and still drinking so I didn't think much about it. I've just took him out then and he felt really skinny so I weighed him and he only weighs 250 grams. He is three and a half and at one stage was over a kilo in weight. I'm really concerned about him, I'll be taking him to the vets at the weekend but is there anything else I can do for him?