I feel trying to stand them up now is better than trying later. My boy is almost 2 years now. I taped his floppy ear up last week when he came home from being neutered. I think his ear stood up at one time but flopped back down for some reason. when he tilted his head back sometimes his ear would perk up just like the other. I figured my as well try while he was groggy and wouldn't be bugging it. I taped it up for two days, and now its standing up more than before and for longer times!.
unfortunately if this doesn't work for you right away it may take you a long time to train them. I know that maybe if i keep taping for a few days, and letting his ear relax with no tape for others, in my case his ear my get stronger and stronger.
Good luck anyhow.
Kisses!
