I am a dog trainer and Pyr owner. Pyres are great flock guardians and and family pets. They, do, however, require training in order to learn their jobs do their jobs well. If you don't have the time or knowledge to train a puppy of ant breed, don't get one. If your training methods are yelling, punishment, and intimidation, you might want to consider finding a dog who is older and already trained, or hiring a professional. While Pyres are independent by nature, they are also sensitive to their owners' needs and emotions. They don't do well with owners who used force based training. They still need supervision, care, and interaction.
Pyrs bark - a lot. That is how they guard. Pyrs can have great recall, but they do wander. Their job, for centuries, was to go out with the flock, sometimes for weeks at a time. If you do not have enough property, good fences, or plan to supervise them, pyrs quickly become disa-pyrs.
One of my Pyrs is a rescue, she was surrendered for killing a chicken. The owner was under the impression that the other dogs would teach her. Instead they intimidated and starved her. The owners yelled at her and punished her. She was fearful hesitant and sick at. 7 months. She is now 2, and my constant companion. She is a therapy dog, has never tried to harm any of our animals, and can be trusted with the chickens. She is my most confident and reliable dog. We have not had any issues with predators since she came to live with us. None.
All of my dogs do some kind of training every day. Every interaction you have with your dogs is teaching them something. All dog, regardless of breed, are a commitment and require training to be able to be the best helpers and companions they can be. If you aren't up to it, maybe motion sensors/alarms/lights might work better to deter predators alert you to potential threats.