Prepared correctly, a horse can supply the nutrition needs for several people for quite awhile. Initially, steaks and roasts are quite tasty, while horse jerky and potted horse meat can provide nourishment down the road. Same thing can be said for cats (sorry, Haz) and dogs. And that's a good deal more than can be said about the F-150 mentioned above.
The time and energy needed to properly care for a horse will, in my humble opinion, be better spent in seeking out Mormons and stealing their food.
FWIW.
Crusader