
Guest, Black & Tan Gsd's, or white, makes absolutely NO difference to ear erection ;)
Glueing, taping and all other kinds of motivations
will not make the ears stand to attention ;)
IME, chewing has a certain amount of influence, ie, normally, when the pup is teething, they chew more, hence the erection of ears. Nothing more endearing than a GSD with crossed ears, when this happens you assume that they are teething. BUT, take
nothing for granted.
I have had experience of a pup that came from a very good Kennel, but no matter how hard she chewed, nothing would make her left ear stand to attention. So I had a cock eared dog, did it matter? NO, she wasn't ever going to be showed anyway and it didn't detract me from loving her and her wonderful personality.
Of course, he still has time for his ears to go up, but if they don't, then live with it. Unless of course you have bought him as a show dog.....then that's a whole different story
HTH :)