I would leave them alone. Ear carriage and strength can be a genetic component. My bitch produces a small ear set and they usually stand by 8 wks. I have an 11 week old male here who's head is bigger and ear set is different than the other two still here (who's ears are up). One ear up, one down. Both were up for one day though. The pictures look like mine usually do at this time(3-4 months), not an older pup. If they have never stood, they might not. I wouldnt worry, just leave them be. If they were meant to come up, they will.
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