I have a big fat fluffy boy cat who is 7 and a half. He is an absolute nightmare when I am in the kitchen, tripping me up, pinching my food, trying to climb in the fridge, etc etc. Recently though he has suddenly gone right off food, wont even try the things he used to go crazy for. He has dropped from 15 pounds to 10 and is quite boney. He tries to eat but stops after a few mouthfuls. I cant feel any obvious lumps or bumps and his gums are usual colour. He has poo'd but cant find where he has been to see if its runny or normal but he does smell when he comes back in. Hes drinking water but im worried something is up.