Niki and I joined a neighbor and a dog that she's watching today on our walk this morning. The two pooches had met before and gotten along well, so we had them both off the leash on a trail nearby. They were getting along fine...and then something happened and the other dog bit down on Niki's ear and wouldn't let go. I've never heard Niki make the noise that she was making before - it clearly wasn't pleasant. It took a good five to ten seconds for me to pry the other dog's jaw apart (she clearly didn't want to let go). Luckily (and surprisingly), Niki's ear seems fine - I can't see any blood. I couldn't tell at the time where all the dog was biting, and I was scared about her eyes and ears. She seemed essentially back to normal once we got away from the other dog, though (my neighbor walked back home the opposite way that we did). I was anxious at first because there were drops of blood on my hand as I was inspecting her face, and it took a few seconds for me to confirm that none of it was hers...apparently jamming my hands into the mouth of a biting dog had consequences.
Anyway, Niki seems fine, and the other pooch is apparently also fine. Hopefully they'll get along again in the future, but I don't think we'll walk them together without leashes again.