okay so first some background, we have 20 chickens or so 2 roosters (they do not compete with each other overly, one is much older) they live in a coop we lock every night and have a large area to go during the day. The chickens are many breeds however we have had 3 meat breed hens who are about 3 years old (we do not use them for meat only eggs so they are not extremely obese.) one of the meat breeds is fine and seems to have no problems. another one at around two years old seemed to have a problem walking we could never figure out and is still alive (just limping and bottom of pecking order). and the third is the one we have been having the most problems with. first about 6 months ago it began losing weight and molting. It was spring at the time and we assumed the missing feathers and weight loss was just from other chickens being mean. however in the past month its gotten worse. Now it has lost almost all of its feathers (but for some reason its shaft, the hard pokey part is still there giving her a porcupine like appearance.) and was limping, along with being extremely small. we seperated it and made sure it had enough food and water and begun researching the problem. just today (fall keep in mind) it is now still looking pretty bad. she seems to function fine (running out to meet us does not mope around at all) but her come is slightly bloody, and skin underneath is slightly yellow (along with the previous problems.) We are wondering if all of this is a mix of things (maybe failing liver, hurt by predator, hurt by other chickens, some kind of other sickness) we are unable to help her. If anyone has advice please respond ASAP!