I have a 15 year old cat. The past 2 years he throws up at least two to three times a week. In the last 3 months he has started to use one room as his litter box ocassionally maybe 6 times. He also has started picking at the floor in the kitchen for any crumbs. He has never missed the catbox in all the years I have had him and he use to scratch at the floor if anything was out of place. Oh, his stool has some blood in it. He has also lost weight in the last few years now he is bony but he eats regurally. He is also an inside only cat. What is the problem. Help< I may have to put him down if he looses any more weight.