My chicken is almost 7yrs old, both her legs are swollen. I have been agressively been putting vasiline and mineral oil on all my chickens legs for the past few months. I know for sure one of my hens had leg mites, I don't think she does. She looks almost like maybe she has arthritus, she still gets around fine. I've noticed over the past year she has gradually lost her voice, tonight I was checking on them and now she sounds like she is wheezing. Her face is not swollen, when she breaths. I did check her awhile back to see if she had gape worms and didn't see any, I'm thinking she probably has a tumor. I know she is getting old for a chicken, I guess I should expect maybe its her age and she is getting old. Is it possible they can have arthuritus and swell in there legs? I checked her throat and her larynx is half opened. I don't see gape worm.