Oh her weight loss isn't that rapid...Not in a worrying sickness way. She has a bit of a flank now instead of looking like a sausage. That's all.
I would like to make sure it's not exercise related before I jump to cancer as that seems a bit extreme given that she is now exercising for the first time in her life. It seems much more likely that movement is the cause of any soreness than a prolonged sickness.
I spoke with her old owner this morning. She did not wake up sore with them that they noticed so this is a new development.
Even assuming it's exercise related my question a long term one rather than fixing her now. I think now all she needs is a bit of a break. And maybe I need to find some grass to walk on rather than country roads for a bit til she toughens up.