Dragonblood subtype qualifies the creature as a dragon for feats, effects, powers, spells, items and harmful effects. The effect of animate dead spell appears to target the dragonblood creature as if it were a dragon. The templates then wash the dragonblood subtype away, along with all other sybtypes, while retaining the subtypes' immunities, if any. Remember though, even if the original critter's HD aren't 12's, they don't change...