1.Do you know why it happens temporarily and for how long? because right now he is loosing his teeth.
2.how would you go about taping his ears and for how long and is it okay for him?
3.do you think we should tape his ears just to be sure that they go back?
I don't know exactly why teething effects ear carriage, I just know it does. I learned about it back when I had my dane cropped and I had to tape his ears. It may very well be temporary because he is teething right now. There is no way to know for sure if they will return to the button position or stay rose ears from here on out. You may wake up tomorrow and they could suddenly be buttons again, you never know.
To tape ears, I just use regular first aid adhesive tape. I gently sandwich the ear in half so the two edges are pointing upwards. Then I apply the tape snuggly, but not too tight around the whole folded ear and leave it on for about 2 days on then 2 days off. I do this until all adult teeth are in. Sometimes, despite my efforts, the ears will still go back to the rose position. In this case, we just tape for a few days before the show.
It is safe to tape ears if the tape is applied so it is not too tight and you watch for skin irritation etc.
If it were my dog, I wouldn't bother taping him. I like the rose ears on him though. If he has pittie in him then he may very well have rose ears from here on out. If you are stuck on buttons, then you can sure try taping.