An ear pocket can form where the ear meets the top of the dog's head. The ear will sag over the top of the dog's head and lean inward, so that there is a "pocket" between the ear and the top of the head.
When you use a bumper to correct a pocket, or to keep one from forming, you tape an extra piece (the bumper) to the post. Take a look at our tutorial on posting with backer rod https://www.dobermantalk.com/ear-crop...my-method.html
One change to the tutorial directions though--one thing we do NOT advise is using of vet wrap on the posting job to tidy it up. Vet wrap is tricky to use; it is easy to put it on too tightly, and it tends to shrink if it gets wet--that can restrict blood circulation to the puppy's ears, with nasty results.
When you put the post in the dog's ear, the bumper needs to fit into the ear so that it puts pressure on the part of the ear that meets the top of the dog's head. Play around with your dog’s un-posted ears. With your thumb, press on inner part of his ear where it meets the top of his head. When you find the magic spot where your thumb’s pressure makes his ears stand properly, that is the area that should be pushed out with bumpers. Let the bumper act as your thumb does by pushing out the problem area to straighten his ear up. Try to tape the ears so that they point outward slightly at about 10 and 2 o'clock positions \_/
Oh, and make sure that his ear edges are completely healed before you post his ears....you need to wait until all the scabbing is gone and you have pink healthy looking edges where his ears were cut. It may even take a week or so after the stitches are removed for that to happen. If you tape over an open area you are risking infections, as well as making the process more uncomfortable for the pup.