Ear cropping is cosmetic and not done to improve a dog's hearing
Amazon.com : Dandelion Dog Ear Posting Kit with Forceps Locking Tweezers Clamp-Ear Stand Up Support-Tape-Cotton for Doberman Pinscher Dogs, Dog Ear Stand Up Tool, Dog Pet Ear Hair Cleaning Hemostat Forceps Set :
Ear Cropping | Why Do People Crop Dogs' Ears? Things to Consider
Doberman cropped ear posting HOW TO! - YouTube
How to Make Doberman Ears Stand Up Without Cropping | by Iqra Aslam Direct Response Copywriter & Writer! | Medium