I have a 12 week old pullet(?) that at 7 weeks began to walk funny. I looked up lots of BYC info, and decided that she may have a vitamin deficiency as there were no noticeable injuries, her sisters(?) were all fine, and except for not wanting to walk "right" - I couldn't figure out what was wrong. Because I was a little worried that she may have an infection, I gave her (3) doses of Tylan 50 over 3 days and supplemented her (and the others) water with Sav-A-chick & probiotics/electrolytes. After a week, she seemed just a little wobbly, but I thought maybe she just wasn't getting enough exercise, so she got to be in a bigger area with just one flock mate. Five days ago, she came down with a very bad respiratory infection and her legs went out at angles, with the feet seeming to be very contracted. More research produced little results, except made me think that again, she is affected by a vitamin deficiency - so I have really stepped up the chick vits & have started to give her some Vit D3, Calcium, and potassium - hopefully in the right doses and today is her 5th dose of Tylan 50 (so, no more from what I understand) - and of course I isolated her from the others. Something is working, as she is still alive and her mouth breathing and rattles/crackling has really subsided. BUT her legs concern me. When this first happened, I thought one of her hocks (at the joint, if that isn't the joint) might be a little hot and seemed slightly bigger, but other than that - no injury. Today, I had her flipped on her side, just checking her out, and I saw that there was some bubbles/fizzing coming out of the hock that and it is noticeable bigger than the other one. Can bumblefoot start at the hock? I am going to check the feet, but since her feet seem more contracted than having any noticeable sores, I don't think it originated from there. I am going now to set her in a warm Epson salt bath, and then apply bacitracin on the opening I did find (very small, maybe 2 mm at the most). I'm hoping my pictures will attach - so that you can see what I am looking at. The one up close at her hock (joint?) is blurry, but this gal has not lost her fight - in fact, I may just name her Ms. Piggy if she survives, as she is eating like I have been starving her - and that is far from the truth! Since I got her at 3 weeks, she and the others were on medicated chick starter (Southern States) - and that's it. From what I've read, it isn't good to give them treats when they are young, so I just haven't. Her poops were normal, except on the initial doses of Tylan, and still, all her sisters are fine. I was thinking of taking her to the chicken vet, once she recuperated from her cold, as I would like to keep someone else's bird from getting sick to. I've got some powdered antibodics that I might start her on, now that she has received as much Tylan as is allowed. Any thoughts on that? Also, she tries to stay on her butt - and now that she seems to be better from her cold, she is trying to fly some when I have her out of her sick den.