We have a feral cat who lives in our yard who seems too thin. We actually took him to the vet and had a full blood chemistry and fecal test done but the results showed him to be quite healthy. He eats well and seems very happy otherwise. So is he just a skinny cat by nature? It's a tougher situation because he is feral and lives outside but we have many ferals and they're all bordering on obese! Has anybody ever had a cat who was always thin?