Horses and dogs can eat leftovers in moderation, but they must be careful not to be too salty and greasy. Feeding leftovers intermittently can help horses and dogs replenish nutrients that are not found in dog food, but the leftovers must not be left out. Rice is the staple food because human meals contain condiments, and dogs’ body structures are different from humans. Eating leftovers for a long time can cause physical diseases.