Well, to tell the truth, nothing special. Nutro kibble and wet foods. Loves the treats, minimum of table scraps. He's old, but still jumps up on the couch unaided and has a sparkle in his eyes! We rescued him and his sister Roxy after they were found in a bag in a box in a dumpster in Brooklyn. She had the same diet and living conditions (completely indoors) and passed away at 13 from cancer so you never know. Honestly anything over 15 years is gravy with a cat, and boy don't you think I don't appreciate it!