My cat seems to have ear mites - shaking her head, scratching more than usual, I think I can see some black bits in there. I can't flip back her ear to check, she won't let me. I can sniff her ear as she shoves it in my face, it smells fine.
I put some spot-on flea/mite treatment today. How long does it take for the scratching to start subsiding? I'm asking as I have a small amount of doubt it's mites (could be food allergy maybe), as I took her to the vet a week ago for annual check-up and he didn't see any. She could have picked them up at the vets I suppose. She is an indoor cat apart from about 2 minutes in the garden every other day.