My guy was weird as his were up at 5 weeks. I unfortunately got him at not even 4 weeks old, and he was very sick. I put him on raw and magically, they were up at 5 weeks lol. His left one went floppy for about 2 days and then never again.
Point being, ALL DOGS ARE DIFFERENT. Although I heard feeding raw helps? Maybe it's just another ear rumor though lol.