Hello!
Luna could have a couple things going on. When dogs have red ears, it could be due to an infection in the ear from bacteria or yeast, or they can have something stuck in their ear like hair or a grass seed.
You can try flushing her ear out with a 50:50 mix of white vinegar and water and use a cotton ball to clean the ear once the flush is done. Here is helpful video on ear cleaning:
https://www.youtube.com/watch?v=cC0l1rlYi5Y&sns=emIf this doesn’t resolve the issue, have your vet examine the ears. They can test for infection and also see if there is something stuck. They can then also prescribe medications to clear things up.
Best to you and Luna and thanks for using Pet Coach.