Sharav’s favorite treat was the rind of a parmigiano reggiano (the king of cheeses), but he also cherished mammoth bones, and peanut butter, and beef trachea, and razor-thin slices of hot dogs.
Mostly, though, I used to give him treats that were made from exactly the same ingredients as the kibble that I fed him twice a day: Natural Balance duck and potato formula. He never seemed to mind, either.