Hi guys, I have a male 22-week old GSD puppy with floppy ears and is still in his teething age. His parents have both erect ears so that's why I'm pretty confident that his ears will go up eventually. His ears goes fully erect just for a couple of seconds, especially when he is alert, then goes back down. I have read some other people's comments that if you caught your GSD puppies' ears fully up even for just a couple of seconds, it'll definitely go up, 100%.
P.S. My GSD is actually 22-weeks old as of the moment. So, pardon for my wrong tittle.