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It depends on the dog. We got our purebred Great Pyr from a no-kill shelter, which was run by a vet that owned his sibling. We were the third family to adopt Titan, and he was over 1 year old when we did adopt. We didn't have any animals except him at the time, we were living in the Houston area. It took about 6 months for Titan to settle down and realize we were keeping him.
Five years later, Titan was guarding our newly purchased farm and a flock of chickens. Our 2 acre property is completely fenced. Because Pyrs need to know their boundaries, when we first moved here we walked him around the fence perimeter. We've been here 5 years, and he still walks the perimeter a number of times a day. He is with the flock when they are out foraging the acreage (sunup to sundown), but he sleeps in the house at night. If he hears noises, he barks and we let him out to investigate. Sometimes it is feral dogs on the road, sometimes deer in the neighboring fields. Once he caught a oppossum near the compost pile, but aside from that, we have had few predator problems. He barks at and chases low flying hawks, and we have never lost a chicken to hawks.
Titan has never shown any interest in the chickens, except he does love to roll in IT. He did not have any special training, except that we introduced him to the flock as day old chicks and explained that he would be responsible for guarding the chickens. We watched him for a couple weeks, to make sure everything was okay. As they say, "Your results may be different".
I never heard that a Pyr will only go so far if they have bonded. Even though our gate is posted to watch for the dog - two years ago the electric meter reader left the farm gate open when he arrived to read the meter. Titan left the property. Our nearest neighbors are a quarter mile in one direction and about 1 mile in the other. People drive 60 down our tiny country road, so we were worried he would be injured before he got home. I went looking for him, dh was at work. When he left, the meter reader shut the gate and Titan couldn't get back into the property! Luckily, the mail carrier saw what had happened and opened the farm gate for Titan. Titan was gone for about an hour and then came back home, based on when I left to look for him and the mail carrier let him back in the gate.
This is a good article about buying a LGD
http://www.sonic.net/~cdlcruz/GPCC/library/buy_lgd.htm