About a week ago, I noticed that my 12 week old pearl leghorn was limping on one leg. I took her out and checked her over and tested the leg, but she showed no signs of pain and still had movement. I thought she might have injured herself jumping around the coop or the yard, so I decided to keep an eye on her and see what developed. By the next day, she had no use of the leg and was dragging it behind her, pecking at it and just generally flopping around. She still had use of the other leg, and was eating and drinking normally. I checked her foot very carefully for signs of bumblefoot, and didn't see any. I turned her over and moved her leg around. Still no protest or signs of pain, but there was no resistance and the leg was very loose and almost "hanging". I checked to make sure that her tendons were in place, and that wasn't it. A day or so later, she had lost the use of her other leg. The toes still curled but there was the same general weakness as I saw in the first leg. The toes were curled under and her feet looked like little fists. At this point, I had her separated in a small area. She was still alert and sweet and eating and drinking normally. Her stools were also normal. I was afraid it might be mareks, but she had been vaccinated as a chick and I wasn't seeing any further progression of the "paralysis". I wasn't even sure that it WAS paralysis, but she definitely didn't have use of either leg. I had read about vitamin B deficiency, so I started her on liquid B in her water and she drank it right up. I was also giving her mash of egg yolk, chicken feed, yogurt and a few cut up grapes or grated carrot and apple. For a day or so, she seemed better, creeping around on her hocks and foraging a little. I still kept her separated during the day, but was in the coop at night with the others, where she kept to herself in a corner. This morning, I went out to the coop and it looked like a bomb had gone off. There litter was everywhere, the food and water had been overturned and my poor chicken was lying half buried in the shavings. I let the others out first, then went to see about her. She was lying in what turned out to be a puddle of her own blood and feces. It seemed like a lot of blood loss... At first, I thought she was already dead, but she was still breathing. She opened her eyes, but didn't move. I placed her on a towel in a pet carrier, and she just lay here. I cleaned off the shavings and checked her over. She was not pecked or injured but her vent was slimed with the bloody feces. I attended to the other chickens and then went back to her. She had pooped all over the towel and it was mostly blood. She couldn't lift her head. At this point, I had to say goodbye and put her down. There was no way that her life was bearable with what looked like a lot of suffering. Her sweet little light had gone out of the world. I'm posting this to ask that if any of you have any experience with this, please tell me what likely happened and how to prevent it from happening to my other chickens. Also, so that if anyone is having this experience now, maybe you can learn from mine. Be peaceful, my beautiful Chicoletta.