Take a look at Tarter Farm and Ranch Equipment Elite Series Dog Kennels. You buy the panels you need and put them together.
You can build 5' x 10' or 10' x 10'. They are all welded and powder coated and corrosion resistant. Mine are 2 years old and not a speck
of rust. I attached 4x4's across the top and put a metal roof. They just sit on the slab. Very heavy . No need to bolt to slab.
I paid aprox. $550. per kennel. I saved on the second one because it shares a panel with the first one.
http://www.tarterfarmandranch.com/switch.php?fn=catalog.details&cod=DKFHDG&site=gsa&emp=gsa 
