Here's the method I used to post my Doberman's ears after cropping. I don't know if it will work on your dog because I haven't seen his ears and they're not cropped. How floppy and large are they? How old is he? If he's older than about 5 months, I doubt if anything will train the cartilege to stand at all if there's much ear flap there. But you can look at this if you want.