Just a question out of curiosity, with the acreage you have I would think your LSDs could have access to all your land? Do they not have access to where your heifer and bull are because of fencing that keeps them out? And are the cows so big that no predators bother them? Or the bull just keeps them away? (I've heard/read bulls can be moody) I would think when she gives birth the calf would be vulnerable to predators just as much as lambs are?
We do not keep the dogs with the cattle, the bull handles any predation problems just fine.
He is very protective of the calves and is a great baby sitter... he is also intuitive and knows that a fox is no threat to his children.
The dogs all rotate with the poultry and the sheep... depending on where we need them the most at the time and who is best in what areas and with what livestock.
For instance, Flo, our oldest girl, is our most versatile... she guards anything and will stay in the worst of fencing.
My male till stay in any fencing IF there is no threat... if there is a threat, only hot wire will keep him in.
However, he has not yet been with ewes who are lambing. He is rather rambunctious for his age and my polypay are lambing right now, so he is with last spring's lambs while my older girl is with the ewes who are lambing on the north 7 acre pasture.
My young ***** is the mother of the pups, so she is rather out of commission in the large pastures right now.
She is with the poultry that is closest to the barn and a small group of sheep who are known to be puppy lovers (this encourages bonding with the sheep).
Because we are rearranging for winter and building the new pens, my cockerel chicken tractor was in the way, so we drug it out to where the cattle were... this is what attracted the fox. They were moved back at dusk to spend the night under the protection of my momma dog and pups.
So... short answer is, no, I do not let my dogs wander the entire property. They guard the group they are with and they work best in pairs, especially when out in larger pastures away from the house where we can't see them.... only about 35 acres is fenced, and only about 30 of that is decent fencing. The fencing in the woods is terrible, but with nothing but a few hundred acres of woods beyond it there is no need for the cattle to ever put pressure on the fencing. Once the pups leave (except for the one I am keeping), the momma dog will take over the lambing flock and the pup will be put with my older ***** who is a great teacher. So it's all a matter of who I need where at the time.