I have a 15 year old male ragdoll cat who lives indoors. He is pretty skinny but always has been, probably due to a rough start in life (we rescued him). He is a bit funny with food, sometimes doesn't eat much for days, very fussy etc etc. But recently he's decided he is hungry all the time - cries for food all day! He only has wet food pouches and is currently asking for his third one of the day. Should I feed him 'on demand' or tell him to stop being so greedy?!