Chipmunk is a six year old Welsummer. She is in lovely condition (apart from just starting her annual moult), and was laying up until recently. A few weeks ago we noticed that she was showing signs of discomfort when walking - pushing herself up on her toes, not putting the flat of either foot on the ground. We have checked her over quite thoroughly - there is no sign of scaly leg mite or bumblefoot on either leg/foot, no swelling or deformity anywhere we can find. She's not moving around in the garden with her companion as much as she used to but is still alert and bright. Any ideas, or experience of arthritis/gout in chickens? It's the fact that it's the same with both legs/feet that's got us uncertain about what it could be. She's certainly not looking comfortable walking.