Having read up to this point, I I'll have to throw in my 2 cents for that Scottish Collie. You need something which won't wander. On some homesteading and goat raising forums I've heard great things about the English Shepherd. You might also check that one out.
We have an Anatolian Shepherd and a Great Pyrenees, which I sometimes call our “big barbarians.” We have 10 acres and are surrounded by ranching neighbors. We absolutely love these dogs. Our neighbors are all ranchers, and they all equate "big white dog” with “protects livestock.” So they are fine with our dogs' forays onto their land. Once, after we finished boarding some friends' horses, our Pyrenees disappeared for half a day. I went looking, and found him standing guard over some of the neighbor's cattle.
Both of our livestock guardian dogs killed some chickens when they were young. This seemed mainly on account of playfulness. I caught the Pyrenees when he bounced on a chicken, and reprimanded him. He never did it again. A few months latter, I found him laying down with a couple of newborn chicks climbing on him. He wouldn't move, for fear of harming them. Both dogs have been great with goats and sheep. Interestingly, our sheep seem to instinctively know a livestock guardian dog when they meet it. Our goats do not.
The Anatolian was more challenging as a pup, being much more strong willed. He killed a number of birds. He would eat them, I believe, to clean up the evidence. I kept correcting him and one day, about the time he left puppyhood behind, he simply stopped killing any of our poultry. About that time he also became exceedingly concerned with my opinion of him. I could probably get the Anatolian to do most anything on the basis of praise. Neither of our large dogs requires any physical correction. They are very sensitive.
It is my impression that the Anatolian is more trainable. But then, the Pyre does what we want him to, without any training at all. The Pyrenees is the more sensitive of the two. Our Pyre is an incurable car chaser, having been clipped at least five times. My son, who is a veterinarian, jokes that he only has two brain cells, and they can't agree. The Anatolian is very car wise. Upon occasion he'll appear to chase a car. But he never gets close to “catching one.”
Both dogs could be called wanderers. But since we neutered the Pyrenees, he seldom goes very far. The unfixed Anatolian, on the other hand, has been away as long as two days.
It has been our custom to pen our dogs during the day. But recently we've started leaving them free all of the time. They don't cause any trouble, and they do guard around the clock. We've had some trouble with winged predators getting chicks and ducklings. The other day I saw two vultures land in our back pasture. Instantly, both dogs sounded the alarm, running toward the pasture fence. The Pyre ran along the fence, barking. But the Anatolian leaped over the fence as if it wasn't even there. He chased the birds away. I went out to see why vultures would land in our field, and found that, the night before, the dogs had killed a raccoon, and left the body in the field.
Our dogs easily kill coyote and coon. Last fall they tangled with a black bear. I don't believe they seriously harmed it. But the Pyrenees had at least a cracked rib or two.
We like the Anatolian because it will guard against trespassers. Our Pyre would not, for a long time. Recently he has begun guarding, even against strange humans.
Our summers are brutally hot. The Anatolian has an advantage here because of his shorter coat. Crosses between the two breeds are exceedingly popular in our region. We always recommend obtaining a pup from someone who has working parents. Papers don't matter.