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Cheyletiellosis, a contagious skin disease affecting dogs and cats cause by an infestation of parasitic Cheyletiella mites. The condition causes excessive dandruff, but the euphemistic name also refers to the fact that the mites are large enough to be seen moving on the top layer of the animals skin. The poor animal was crawling with walking dandruff by the time his owners brought him in for treatment. That's not just dandruff on your cat—that's walking dandruff. You'll need to see a vet about that.
walking dandruffand galloping dandruff
n. lice. (see also pants rabbits.) The bum called his lice “walking dandruff.” I don’t know anybody with galloping dandruff—I hope.