Or you could make it super powerful, so your arrow pings off its scales then it shoots several 1000 fire damage/1000 damage health fireball at you
The main trouble with dragons is making an workable model, it has to be big which means you get trouble with its interactions with the height of doorways, it has to be long which means it has trouble turning and it has to be big, long and have feet which means it will have trouble interacting with you in combat.
But if you are going to have it sitting around and not fighting or attempting to move through doorways, forests etc then it shouldn't be too hard to make. Modelling is a fairly sizeable task though. I'd love to fight dragons but given the inheritant differculty of making long/tall things with legs I'll settle for seeing it not try to eat me.
EDIT: Aside from a zoo (which would be very cool, you could set animals not to try to attack you through the bars but the zoo keepers could give them "prey" at certain times of the day which they would hunt), you could add the imperial dragon in a big chamber in the imperial palace.
Perhaps I might add a zoo to the long list of things I will mod into the game, I could work on working a dragon into the game if someone provided me with a working model; but of course if someone made a working model then they are more than skilled enough to put it into the game