In this question about Game of Thrones it is asked if the White Walkers can reanimate dragons and control them. The answer postulates that dragons might burn up upon death. It also posits that dragons are, in fact, animals.
This got me to wondering if wargs are able to control dragons. Since Bran is a warg, and a powerful one at that (he was able to control Hodor), would he be able to control Daenerys' dragons?