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RIR are a very touchy breed. I have seen mean ones and nice ones. Surprisingly all my dad's are pretty nice, there are a few hens that will try to peck you if you steal their eggs when they are on the nest, but other than that they are very docile. Even the roos, and I have seen some nasty mean RIR roos!
If your dog flat out eats the chickens, you would probably need to make you chicken run out of chain link or something similar that is heavy. Regular chicken wire would be nothing for the dog to get through. Also make sure there is a top on the run, and probably be a good idea to bury some wire a few feet down to discourage digging.
Any chicken should be nicer if raised up around you, but any rooster can be mean also. There are certain breeds that are good layers/meat birds and docile, but there are exceptions to that rule as well. I know matt y. on here had a buff orpington roo that was super mean! They are supposed to be very gentle birds, so it is all how they are raised and bred. The only problem with single combed breeds, which rocks are, around here is the cold. Their combs can become frostbit, which can cause infection. If your coop is sound, with no drafts, this shouldn't be a problem. You might end up needing to put a heat lamp in there on real cold nights so they don't get frostbit.
You could get them earlier (I believe most hatcheries start shipping end of January early February) provided you have at least the building part of the coop done. You would just need to make sure they are warm. A heat light or brooder heater should be enough to keep them warm. Or you could always keep them inside till they are about 4 weeks old. They would still need heat, though it wouldn't be as critical, since they would be mostly feathered by then.
I think I covered everything, ask away if I missed something