I believe he's full grown, but I haven't learned to speak dragon, so I can't say for sure. [There's really no way to tell whether she's being serious or joking rn.] But as for why he's so small, he's called a pygmy dragon. They're much smaller than true dragons.
[Bubbles is the best name in the world, how dare you.]
Video;
[Bubbles is the best name in the world, how dare you.]