The day before my chickens got attacked by the neighbors dog, I had dusted all the hens to get rid of their lice. Then, the next day, 4 of our hens got attacked and killed. We decided to get 5 baby chicks the same day (that was the Saturday before Easter. Officially the worst Easter ever!). We gave the chicks to our broody, and I have been watching the hens for any signs of the lice returning. We couldn't redust them due to the fact we had the chicks with them. Well, I am finally noticing signs of lice again. Do you think the chicks are now old enough to be dusted with the lice stuff? They are fully feathered (except the very front of their head) and they, are at my guess, 7 1/2 weeks. Any help is welcome.