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Dog runs work great for chickens, yes.
The recommended 10 square feet per chicken in the run PLUS 4 square feet per chicken in the coop is wise.
I would recommend going with the panels so you can enlarge it if you want to later. Also, line the bottom of the fence with chicken wire or hardware cloth to prevent something pulling your chickens through (happened to me).
Netting on top for hawks.
Apron out to prevent digging predators.
The bigger the better! I have a 6 x 10 kennel and wouldn't want 4 hens in there unless I could let them out to free range. It is just so squeezy.
The above poster is right, though- they get a lot of protection from dogs by being IN a kennel.
Alternatively, you can make a great run by using hardware cloth/welded wire- check out the coop pages!!! Tons of really wonderful runs. You must decide how predator proof you want your run- it will greatly affect expense.
1/2 inch hardware cloth is the only thing that will keep predators out though. Weasels and rats can get in if it's smaller.
I don't have predator proof runs, because I wanted BIG. Really big.
Here in this pic you can see the difference - the pen on the right is just chicken wire, with 2 inch chicken wire covering the top to keep hawks out. The pen on the left is a huge garden, with 8 foot high welded wire fencing (the rectangles of which get smaller as you get close to the ground = "rabbit fencing."
Then there is hardware cloth, which is really spendy.
I know you didn't ask all this, but I thought I would mention it anyway.
Here is a pic of my dog kennel. (Everyone please note this is the setup that lost me a chicken to an owl due to no lining of the chain link.)