I bought a trio of Silkies from a breeder last Saturday and I found out yesterday that they had creepy-crawlies all over them. I have now identified them as red mites. We dusted with a 'livestock dust' that was useable for chickens with 'northern fowl mites'. Gave the birds a good dusting, on the crests, under wings, on back, vent, tummy, the works. I also changed their shavings and recleaned their brooder. They're about 3 months old. I looked them over this afternoon and they still have mites roaming around on them. How long does this stuff take to effectively work? When do I dust again to get rid of the second 'fleet'? Does dog tick and flee shampoo really work? Any advice or help appreciated.