In the meantime, I'll do my best to answer your question based on the information you've already provided. I understand you're wondering if there's anything you can do to make his damaged ear stand up more erectly. To answer that, I'll start by describing what normally holds an ear in its upright position. That job is performed by the cartilage of the ear flap. Muscles at the base of the ear also help hold it up.
There are a few different things that can affect the way the cartilage and muscle that support the ear and cause the posture of the ear to change:
- Ear infections that cause ear swelling. This would also have redness, drainage, and odor.
- Ear injuries that cause ear swelling.
- Ear tumors that weigh down the ear flap. This would be very obvious, and I see no sign of it in the photo.
- Permanent damage to the cartilage that holds the ear in its normal shape.
Out of all these possibilities, in your situation I'm most suspicious about the last one. It's very likely that when his ear was injured, the cartilage was damaged and healed in a different position. I know you're wondering if there's anything you can do about this to change it now, but I'm afraid the answer is no. If his ear cartilage was damaged and healed in a new position, this change will be permanent.
I'm sorry. I wish I had better news for you. I hope you can find some comfort in the knowledge that if this is the case, at least it's not painful or bothersome to him. He will have simply become used to it and it won't bother him at all.
If, on the other hand, you are seeing additional symptoms like I mentioned above, it's worth a trip to the vet to treat any underlying new injuries or infections so you can help his ear be healthy again. If there is a new injury or infection, then it remains to be seen if the ear will return to its original posture once the problem is treated.