The trick to finding food for a cat with digestive issues is to figure out what ingredient (singular or plural) is causing the problem. As EmersonandEvie mentions, it's often fillers that cats are sensitive to. Foods with potato that are labeled "sensitive stomach" really get me crazy because one of our cats is sensitive to potato! Potato isn't a supercommon sensitivity but others on the site have reported that their cats also can't eat it.I pay $24 for a larger bag of high protein. The problem is its not for sensitive stomach
Cats' sensitivities can be a very individual thing, making them difficult to diagnose, which is why the best approach for many cats -- including ours -- is to feed the simplest possible recipes, without vegetable-based carbs (particularly potatoes, peas, and even grains that are often included to boost protein numbers), and seek out foods that are as meaty, animal-based, as possible. Cats are carnivores so they're built to eat and digest meat, not potatoes and peas. If fillers aren't the problem, there are other approaches to figuring out which proteins are causing the problem but just getting rid of carby ingredients works for a lot of cats.