There are many theories about how teleportation could work (warning: tvtropes). One of them is that the body is completely disassembled on a molecular level and reassembled at the target destination. This leads to ethical problems like “Am I still me, even after I got completely disassembled and the original me has been destroyed?”.
What I am interested in is not the ethical implications of teleportation by disassembling and reassembling, but the applicability to shapeshifting.
Shapeshifting is the changing of ones body from one form into a different one (again: tvtropes). An example that is often used is the Werewolf – a human that can change into the form of a wolf and vice versa. There are already a few questions on WorldBuilding that deal with the transformation, but nothing about disassembling a human on a molecular level and reassembling all of his molecules to form a wolf.
For this scenario, we will disassemble a roughly average European human and say that this human is about 1,70 metres tall and weighs about 70 kg. Only the molecules and compounds of this humans body can be used. The machine that is used will not disassemble the body into single atoms, but into the existing molecules and compounds (e.g. glucose, water, ...). There are no clothes or other materials that could influence this little experiment in any way. This includes things that could potentially be in the stomach of the person, other organisms, piercings, ...
How big would the wolf be that I could create from the molecules from this human? What differences to a normal wolf would this one have, if I were to use all of the molecules from the human?