1) What type of bird , age and weight (does the chicken seem or feel lighter or thinner than the others.) Bird is a Buff Orpington pullet, approximately 8 weeks age. It is definitely smaller and lighter than the others, but they are of different breeds and only approximately the same age. While it was the smallest when I got them all, it definitely has not put on size and weight as fast as the others. 2) What is the behavior, exactly. Bird is reluctant to walk and spends most of its time bedded down on the ground. Walking is hesitant and appears painful. Wings droop and she appears to have difficulty keeping them folded up while moving. Some slight lift to the leg scales is noticeable, but not very bad. 3) How long has the bird been exhibiting symptoms? ~2 weeks 4) Are other birds exhibiting the same symptoms? No. Bird is one of 4 (2 Plymouth Rocks, 1 Rhode Island Red, and her). The biggest and oldest Plymouth Barred Rock was picking on her a lot, but nothing too serious and that has waned as the flock established order. Other 3 pullets are active and healthy with no signs of trouble. 5) Is there any bleeding, injury, broken bones or other sign of trauma. No external injury noted. Scales lifted slightly, so legs a bit rougher than the others. Rear toe tends to stay curled down towards pad of foot and front 3 toes tend to be hyperextended. I think therefore she's trying to avoid walking on the pads of her feet, but I can't see anything wrong with them, and she doesn't favor one foot over the other. 6) What happened, if anything that you know of, that may have caused the situation. There was a possibility of leg mites. Also thought there could be an injury (to both feet?!) that I couldn't see. Other possibility I came up with is Marek's. The bird is from a small-flock breeder, so was probably not vaccinated. However, what I could find about Marek's listed an asymmetrical paralysis. Her issues seem to be bilateral and maybe not paralytic. Seems more like weakness and pain. I also thought the weakness could be (at least exacerbated by) a lack of food and water due to being run off by the bigger pullets. 7) What has the bird been eating and drinking, if at all. Grower pellets and tap water. Will not move often to get food and water, so I try to keep a dish in her favorite shady spots so she keeps her fluids and calories up. 8) How does the poop look? Normal? Bloody? Runny? etc. Poop looks normal to me. I don't have much experience though. 9) What has been the treatment you have administered so far? Bathed all chicken feet with warm soapy water and coated in vaseline. Then replaced roost bar and sprinkled diatomaceous earth on all chickens, inside the coop, and made a small outdoor dust bath. Isolated the lame chicken for 4 days inside (its been pretty hot so I thought that might aid recovery) with own food and water. She's been back outside the last two days (only so much stink we can stand 10 ) What is your intent as far as treatment? For example, do you want to treat completely yourself, or do you need help in stabilizing the bird til you can get to a vet? Intend to treat independently. 11) If you have a picture of the wound or condition, please post it. It may help. 12) Describe the housing/bedding in use Coop is ~4x4', 2.5' high roost bar (this could be a bit high, but the lame chick does not currently use), with 8" of deep-bedded leaves and woodchips.