I’m sure we’ve all had that horse that ate whatever wasn’t nailed down…
Besides the usual carrots, apples, peppermints and horse treats, my old mare ate Skittles, Fig Newtons, grapes, bread, Fruit Roll-ups, Pop Tarts, Fruit Loops, tangerines, watermelon (but not the rind), bananas… the list goes on. She had a particular liking for Harvest Cheddar Sun Chips and Propel. She even ate bute tablets out of your hand (albeit with making a face). The only thing she wouldn’t eat was alfalfa pellets.
I haven’t experimented much with my current mare and people food, but she absolutely adores doughnuts (plain and raised glazed). The only thing she isn’t fond of is peppermints. Her nickname is “Pork Chop” because she’s round and such a little chow hound for all of the usual horse-y foods too.