We have Great Pyr.s. I wouldnt' trade them for the world...I am sure others like other breeds, but this is my breed of choice...We have horses, llamas, goats, sheeps, rabbits, ducks, geese, turkeys, guineas, chickens, feeder pigs, and pot belly pigs....( I think I got all the critters)...
Anyway our female had a litter of puppys in Dec. They are the cutest little fluff balls (kinda remind of what a cotton ball factory would look like if it exploded...) anyway, they were in the house when first born, now have been out in the barn for a while...They are wonderful with all the animals. They have interaction time with them all, but then they are in the milk house at night...
We don't 'train' per-say our dogs to guard, they just do....
Even our dog Jackyl...HE's a purebreed GP also, we got him at 10 weeks and when turned out with the animals he did a wonderful job. He was actually herding up/rounding up our turkeys at one time and then walking them back closer to the house area...He had no training for that, he just did it....
You would love a GP....I dont' even wanna imagine our farm without them, now that we have them...