This will allow you to see adult dogs (the length of their ears, the style of their crops, etc.), ask for advice about who did the cropping, and learn about the amount .
The doberman ear cropping age is usually done at 7-9 weeks of the birth. It is not recommended that the ears be cropped after 9 weeks as the ears cartilage has formed to a flat shape. The procedure should be completed by a vet with experience in ear cropping to ensure a proper, good looking, standing ear.
Ear cropping styles (short, medium, long) – Doberman Forum : Doberman Breed Dog Forums.