Originally Posted by
GreatWyrmGold
From a biomechanical perspective, swords are designed for hands. They're designed to be held tightly by hands with palms flush against the hilt, letting the wielder sense exactly what direction the edge is facing, which is critical because attacks slightly off-angle are way worse at cutting stuff. And there are probably other details that someone who actually uses swords (instead of just reading about them) could tell you. And even if dragons had human-level dexterity with their claws, all of these details would make it impossible to effectively use a sword that small.