[@dragonmancer]
Okay i do like the concept and the type

But

His dragon form cannot be too much larger then Paon. Since large dragons can essentially topple entire cities with ease. 
With that in mind shrink him down in both half and full dragon and it should be okay.

I'd say male elephant or slightly larger.

[@Wick]
If I missed anything let me know so I can make sure the sheet is good if you wouldn't mind