We were concerned about the "in the yard" issue, too. We have 4 dogs, and one of them is a dachshund. Once the chicks were 12 weeks old or so, there wasn't a problem with the dogs. I integrated them slowly while the chicks were in a VERY secure small coop/run, and the dogs got used to them. The only incident was when we added our 4th dog (a mini-doxy). She went nuts when one of the girls fluttered out in the yard and attacked her. Lily (the EE) lost some neck feathers that still haven't come back, but otherwise was OK. Since then the dog has left the chickens alone.
We have 11 girls in a 6x8 coop, and I wouldn't want many more in there. The run is fairly large, but they also get some free time in our fenced yard every day. We live in the country, and that also puts them inside 2 sets of wire in a yard that smells like dogs (to the coyotes). I like watching them from our windows. We live in a berm (earth sheltered) house that faces south, so all the windows are on the south as is the fenced yard.
Good luck with the chicks. I got the last 5 from our local farm store (Orshlen's (sp?)) and they were sexed at the hatchery. I got 5 girls (no roos). the older ones came from MPC, and were also all girls. They only claim 90% accuracy at the hatcheries, though, so you might get a male. It is an inexact science, I understand.
I hope you enjoy your chickens as much as I do.
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