My 6-year old male cat has had sensitive stomach issues ever since he was a baby. He's been on a wet-food mixed with 1/4 cup of dry food diet for about a year now, per his vet because he is so skinny. His current canned food, Blue Buffalo Freedom (Grain Free) Chicken, does not seem to be working for him. His dry food is Nutro grain free. I've taken him to the vet countless times and no one has given me a good answer as to what he could be sensitive to. Are the sensitive stomach canned varieties actually built for sensitive stomachs? If anyone has had luck with a particularly brand or type, I would love to hear suggestions. Thank you.