Is your Pyrenees a livestock guardian dog? I would so love to have one! Yes, I’m sure your dog will be super helpful at keeping predators away, as long as it doesn’t try to eat the birds like my dog does! My Doberman dreams of a Guinea fowl dinner. As far as a night time coop, yes I really think they are a great idea. We have farms near me that buy my keets every year, brood them and release the young adults outside, then buy another set the next year because those released guineas have all been eaten. A coop is a lot more work, but I am way too attached to just watch them all get picked off. I also live on a small acreage (10 acres) so I need a coop and run to limit their wandering and keep them on the property. Our Guineas are much less adventurous when they are only allowed out for half the day.The more I learn about these birds the more I understand how much they need coop training. The coop I will be using is hardwire and surrounded by paver stones. We are going to add an electric fence. I have not seen any coyotes but I have seen bobcat prints. I do have a Great Pyrenees so maybe that helps to keep the big predators away,