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Well, first you need to know what types of predators are in your area. There are those that will dig under a fence, those that climb a fence, some that can go through a fence, some that will reach through, then of course, there are birds of prey. Some people even have problems with snakes and rodents.
As for the coop- it needs to be sturdy, with no holes or gaps for critters to get through, and able to be kept dry, but have good ventilation.
The yard area needs to have adequate enough fencing to withstand larger, stronger predators. Depending on where you live, chain link may be fine. I think though, that a double layer of fencing is best. I've had chain link all but destroyed recently by what I assume was dogs. And it was 2 layers of chain link. I lost all of my birds.
Where I am, Hog Panel or Horse fencing is the best option. Whatever you use, an additional wrap of small diameter chicken wire or hardware cloth will prevent your flock from losing their heads. Additionally, the fencing can be 'dug down' into the ground, or just laid out 6"-1' on the ground and then covered with rocks, or railroad ties, or whatever you choose to help prevent digging under.
If your flock will be outside much of the time and unsupervised, you'll need to think about covering the yard/run, also. I don't seem to have a hawk problem, so the parts of mine that are not roofed, are covered in chicken wire. Be forewarned, though, Racoons may be strong enough to get through chicken wire. Other people use a fabric or plastic type bird mesh as a cover. Many don't have any covers at all.
Hot wire is another widely used option. I use it on my horse pastures, dog kennels, and it is going around the diameter of the chicken yard (single strand near the ground and another at the top). I swear by it.
I live in the country and have quite a few different types of predators. If you are in a suburban area, you probably won't have to go to such drastic extremes. Assessing what predator problems you may encounter ahead of time, and planning your coop and yard design to withstand them will pay off ten-fold in the long run.
And yes, I agree with Yonaton, dogs need training. They are happier, you are happier, and hopefully your flock will remain (alive and) happier. It is just all too common to hear that someone's beloved pooch attacked and killed a flock of chickens.