My lovely eighteen-year-old cat is in very good health generally and is in good spirits - you'd never guess he was eighteen. But he has started to be sick every time he has dry food. We usually feed him twice a day on a mixture of wet and dry food, but over the past few months we've had to switch to wet food only. This seems to make him ravenous. I've been working from home today and fed him a tiny amount of dry food on a couple of occasions (a teaspoon of it, literally). It all came back up again in one go about half an hour after he had the second lot. As I say, he's in great form otherwise and full of energy, goes out, grooms himself, looks in the pink, hasn't lost weight. But he's very hungry all the time and it's driving me mad. Any thoughts? Do I need to take him to the vet? My DH thinks not...