Would it be possible to use magic to mutate animals, shape them to your liking? Easily tame them to their very DNA so they are fiercely loyal to you, change their bone to steel, add some spikes, an extra head etc by using a mix of magic and science?

Also what about dimensional/teleportation/portal magic items or simple magic? Can you have, say, a has the same capacity as a full attic inside it? Can you have fist sized rocks that can serve as small sized prison cells where you can put and keep living beings in?