I recall this happening to someone else on Yorkietalk, but I can't find the other thread. (Either that, or I read about it happening somewhere else.) I feel really bad about this because we expect vets to make the best decisions for our dogs, and perhaps they are, but then something like this happens. I did some reading about oti-pak e and found out that permanent deafness is a rare, but possible, side effect of antibiotics used to clear up ear infections. For oti-pak, I read that temporary deafness may last up to six weeks. If it doesn't clear up by then, I'm afraid that it might be permanent. Ask your vet to look this up for you and let us know what they say.
Our Bella was treated for an ear yeast infection when she was a puppy, but the vet had us use oily eardrops, not oti pak, and the infection cleared up without any side effects. If she ever gets another ear infection, I'll be extra-cautious about what they put in her ears and I'll ask a lot more questions. And I'll avoid oti pak e like the plague. That's all we can do
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Thanks for telling us about this, and I pray that Daisy gets her hearing back. Keep us posted!