Hmmm... Your options are pretty limited then. You either will need to pull out and reset your anchors with each move or add above ground posts at each anchor place for the mares. You could always consider a permanent coop and let your birds free range. Since you have mares then you already have a free range fence perimeter. A permanent coop has a lot of advantages. My birds free range with goats.It sits in a horse pasture, so leaving stuff in the ground isn't really an optionOne of my mares has a neurologic issue and would find and trip on it, sigh. She has an uncanny ability to get herself into trouble.![]()