All breeds have floppy ears. SOme pigs have ears that appear to be standing which is usually caused my inbreeding, over breeding or seen in young pigs.
All guinea pigs are different. I have some with big floppy ears and some with tiny ones that almost stand up on their heads.. it makes no difference to what breed they are.
I must say that I love Bonnie´s and Zirbel´s standing ears and had to get used to Gobi´s (lightly) and Sydney´s (very) hanging ears - but now I love them all cause they flap so nicely when the piggies come running.
Wow! I didn't know piggies ears flopped as they got older! When I got my Domino, her ears were erect. She was cute but she looked more like a mouse than a piggie. A week later, her ears are starting to droop. Perhaps they'll be floppy in a few more weeks. I can hardly wait! Floppy ears flap when they wheek!
Standing ears flap, too, when Bonnie wheeks! Of course, she wheeks with her entire body, runs circles like mad and can't stand still for a second when there's only a faint whiff of food in the air but that's a different topic.