"Pea" gravel ( never heard of peat gravel ) is the designation for a particular type of stone. it is small, smooth & fairly flat.
IMO concrete is the ONLY surface to use in a kennel, because it is the only surface that can be sanitized. it should be cleaned with bleach daily.
if you use the slabs which is what I think someone meant by flag stones - yes, feces & urine will go down between them, so will dog hair & trust me, it will STINK!
dogs get no exercise in a dog run
actually it is very dangerous for many reasons to let your dog outside unsupervised - so I don't think I'd do it anyway.
keep in mind that you will still need a roof & box
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