Anonymous Coward (Boston, Ma) on 09/03/2009:

My dog was scratching his lower back furiously for the past few days to the point I knew I had to do something. I've been laid up in bed and only managed to go to the health food store to get unpasteurized apple cider vinegar, per the postings here, because the store had no doggie medicines.

I cut the vinegar with water, half and half, and sponged the mix on his back up to his neck, because the itching had spread upward. He is a small dog with short hair and so I just soaked the area and rubbed it with my fingers. Within minutes he stopped scratching. He did lick himself for a while off and on but then he want to sleep and didn't constantly wake up to scratch furiously like he had been. He didn't have raw or even red areas but there was a a tiny amount of granular material that might have been frass (bug doodoo) on the surface of his fur. The material was too uniformly small to have been some kind of skin or scab shedding.

I've given him four or five applications over the last few days and his itching is markedly reduced, to the point he doesn't scratch at all for hours. There is still a very tiny amount of the frass-like material but I have not seen anybody occupying his fur. And again, he has no redness or raw areas. Another interesting point is he's never had any skin-related conditions ever and he is eight years old. This came out of the blue and in a major way.