This is a great place to learn everything you need to know about chicken raising! You are so smart to be preparing before getting your chickens! My brother in law gave my daughter our first chicken and we had to scramble to get what she needed. Then chicken math began and soon we had 7 chicks in an indoor brooder while we were frantically trying to finish building the coop! I do recommend that you consider getting 3 chickens instead of 2 that way if something did happen to 1 of them, you wouldn't have an unhappy, lone chicken.
We have had our chickens for 2 years now and last fall added a rescue Australian cattle dog to the family. It took quite a bit of work with her to get her to not view the chickens as playmates or feathered chew toys. Teaching our pup the leave it command has been really important for everyone's health and happiness. My chickens spend most of the day free ranging our 1/3 acre yard. I am usually outside with the dog and chickens when they are together. I still have to keep an eye on Pixar because she wants to follow the chickens and get them to squawk and ruffle their feathers. (She also likes to follow them and clean up after them, if you know what I mean! ) When my daughter and I are not home, my husband just leaves them all out in the backyard together. He says that the dog never shows any interest in the chickens unless DD and I are there. I guess that she kicks into play mode when we are around.