Sarge, my 82 lb.15 month old American Staffordshire (or pitbulls for most people) has these small, spreading circular patches loosing hair, with dandruff-ish looking dry crust. It started off from his shoulders and spread on his sides. Took him to the vet and had all kinds of tests done. It's NOT allergies, mange, or ringworms according to the vet so he had hair samples taken to see what kind of fungus "could" be growing. Dang bill cost me almost 0! He is NOT ITCHY at all and he eats fine. The vet put him on antibiotics (Simplicef 200mg) for two weeks. Has anybody had this experience?