Hi, I bought some chickens a little over a week ago and one has been having a hard time almost from day one. She was walking really poorly and laying down all the time. I didn't know what to do so began adding some tetracycline to her water (it was all our neighborhood feed store had) and she is walking better daily. Her feathers began looking really bad so today I looked her over very closely and discovered lice. She has a good appetite and drinks a lot and is alert. She acts like a normal chicken other that the walking and horrid feathers. I am dusting her and the rest of the flock tomorrow (we have 7) but I am concerned because I noticed tonight that another hen is shaking when she takes steps and is laying down more that usual. I am hoping that all I am dealing with is lice but haven't found anything saying whether they would make the chickens weak. Can anyone offer advice? Thanks!