A dog kennel is fine, should be plenty of room on a temporary basis. Flock dynamics are not much different from herd and pack dynamics. Instinct tells them one must be in charge, and weaker members must be eliminated for the good of the group. As with a dog or horse, the moment one believes itself to be dominant over humans, it must be educated. For those with limited experience with group dynamics in the animal world, the leader of the flock/herd/pack tells the rest when to flee danger, where safe and good food may be found, and when to be still/hide. One should be dominant over the rest, but never over the human keeper nor any other human. The one dominant over the rest should not bully, but protect and lead.
One way you can tell which is the dominant member of a flock is to watch for one who is first out in the morning, last in to the coop at night, which is first to try a new treat/weed/bug and then call the others over to it - most often this role is occupied by a male, but in flocks comprised solely of hens it will be one of the hens. In some groups there is none so dominant as to be this obviously in charge, but I've seen some hens insist the rest go to the coop when a storm is brewing, chase others into the coop at dusk, and signal to the others that they should duck and be still with a single call. I find flock/herd/pack dynamics fascinating and frustrating at once. The humanity in me wants everyone to get along, and the part of me that understands Mother Nature's survival of the fittest rules, is mindful of the risk to the flock of protecting a weaker member, which may attract a predator. Herds of horses will circle new foals while they get their legs under them, but once they can get around, they must keep up with the herd. Human intervention and domestication of these animals has modified some behaviors, but instinct still rules among chickens to a large extent.
