Fluffy seems to be a little quiet and not his usual self today. He's only eaten about half his usual amount of food and seems a little lethargic. He did come and cuddle me in bed this morning for ages but since then he seems to mainly have been sleeping!

He's not making any strange noises or anything and his poo seems normal, he's been weeing etc and not been sick as far as I am aware. Do you think he's just tired or something - how can I tell if he's ill?