I know there are a lot of people out there who have had this happen, but I haven’t heard follow-up whether it reoccurred. Of course, it could be months and months or more before it does…if it does. I’m curious if this is a lop. My vet says just about all lops have ear infections. You can pick up on them ahead of time if your vet looks at more than just the outer ear. My vet has an otoscope hooked up to a computer screen so I can see what he’s looking at. But I think a regular otoscope will show the same…just that you have to take the vet’s word for it 🙂 If you can afford it, you may want to bring the bun back every 6 months (or ask them what they think) so it can be checked and caught sooner.
My rabbit’s ear infection was so bad, his ear drum had ruptured. And I brought him in to be sure he didn’t have a bladder infection! Who knows how long he had this infection. But many are not found until it’s in the advanced stages of which you describe. Is it a lop? Mine’s not. Well, he kind-of is now. The ears gradually fell.
Even with over $1,000 worth of surgery, my rabbit will need his ears kept closely watched. His other ear is infected now. Fortunately the vet knew to do surgery on both ears, as the second ear often get infected at some point.