When I got my female Abigail, she was 7 weeks old. The Breeder had been shaving her ears completely since she was about 4 weeks old. I continued to shave her ears weekly. At 12 weeks her ears are up!
I still believe it was a combination of her diet which I supplemented with extra calcium, from cottage cheese, cheddar cheese and even laced chicken breast with powdered calcium supplements from the Vet.
I was determined to get them up.