Dragon Transport Ship
The dragon tansport ships are a particular kind of ship projected exclusively to carry dragon, in fact they permit for theier huge dragondeck the landing of a dragon.
They could carry around one hundred and half tons.
Often the dragon transport ships had to wait in the open sea for weeks or months as rest and supplying platform for the travelling dragons.
Be captain or sailors of such a ship weren't a real wish for many of the seaman, first because they would be near a dragon, and second because usually they weren't involved in battles so they wouldn't gain prize from captured ships.
The HMS Allegiance was one of them.