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Hello, I'm Dr. Deb and will do my best to help you today.
Since what you're describing is clearly an injury, there's no reason why you shouldn't be able to show your dog. This isn't a birth defect or a fault.
I would, however, explain to the judge when they go over him that he might still be a little tender/uncomfortable and to be gentle near the right ear.
I've shown dogs after ear hematoma surgery and the judge never asked me about it. If they had, I would have explained why the ear looked different from the other one and that would have been the end of it. I wouldn't have been excused from the ring.
I've also shown a dog whose mother bit her when she was just a few days old such that the ear has a notch in it. Clearly an injury and not a birth defect and I've never had any questions asked about it.
I hope this helps. Deb