Build em big and you get all in one package. 100 ft X 20's on a slight hill.
No shoveling. Rain gets it all and pens stay sanitary.
Plenty of room to exercise all day. No need to let them out.
Fleas you can hit em couple times a year with Ortho Tree and Shrub and zero fleas even sand.
Can put multiple dogs in each pen to pair for hunting if you want.
Hot wire around bottom keeps diggers and climbers in check.
Great for puppies as well.