Strange Behavior

We had chickens for several years, but had to give them up when we moved. Now that we are starting over I have a concern. We only have four chicken right now and they just recently got all of their feathers. Due to some unforeseen life events the coop/run isn't ready for them so they are still in the brooder at night. There are a lot of wild animals and neighbors' pets running loose during the day so we don't let them free-range, at least not yet. They are currently in the dogs kennel during the day, which I'm sure is not ideal. So I'm concerned that they may be ill or maybe they are just trying to take a simple dust bath without the dirt. I don't know, and I'm concerned.                       If y'all don't mind looking at this picture and telling me what you think. Three of the four birds are behaving like this. They lay on one side with the opposite foot extended and their eyes roll back while the feathers on their neck bristle. They even try pecking at food while on the ground.

Am I being overly concerned or is there a real problem going on?

Thanks y'all I thought that might be what they were trying to do, but I get really anxious about something being wrong with them. I appreciate your confirming my suspicions, and I will get a pan of dirt (at least until I can get them in their new coop/run).

I have a pan of dirt in there for them now. They are hysterical!