I was wondering if there were any historical examples in ASOIAF about Wargs or skinchangers inhabiting dragons? I have searched here and here and have not been able to find any evidence either way. Thanks
Wargs are only bound to wolves, so it's impossible that one warg control a dragon.
Skinchanger is a more generic term, but I don't think it's possible, the books say it is very diffucult to control birds without driving yourself crazy, and a dragon is a much more powerful creature, with a stronger personality. I don't think it's possible.
In A Dance With Dragons, Daenerys can "communicate" with Drogon, but in a different way, not skinchanging (both keep the control of theirselves).