| Puppy acne usually refers to little pimples that can arise in the folds under the chin and if kept clean, goes away on its own. If not demonex, this sounds more like a staph infection, but even if the meds have not been given long enough for a complete cure, if they are the correct one to hit the infection (assuming an infection) you should have seen improvement certainly after a week if not sooner. I would request another scraping not only for examine for mites but also for culture and sensitivity instead of simply moving from one type of antibiotic to another.
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"The scientific name for an animal that doesn't either run from or fight its enemies is lunch."-Michael Friedman |