don't forget a Medium dragon hide can't be made into much.
Dragonhide: Armorsmiths can work with the hides of dragons to produce
armor or shields of masterwork quality. One dragon produces enough
hide for a single suit of masterwork hide armor for a creature one
size category smaller than the dragon. By selecting only choice
scales and bits of hide, an armorsmith can produce one suit of
masterwork banded mail for a creature two sizes smaller, one suit of
masterwork half-plate for a creature three sizes smaller, or one
masterwork breastplate or suit of full plate for a creature four
sizes smaller. In each case, enough hide is available to produce a
small or large masterwork shield in addition to the armor, provided
that the dragon is Large or larger.
Because dragonhide armor isn't made of metal, druids can wear it
without penalty.
Dragonhide armor costs double what masterwork armor of that type
ordinarily costs, but it takes no longer to make than ordinary armor
of that type.
Dragonhide has 10 hit points per inch of thickness and hardness 10.
basically a Medium Dragon can be made into a Small suit of MW Hide armor or a Tiny suit of MW Banded armor. of course with a MW shield if the Dragon is Large...so in this case no shield.