What materials are good to use to build a safe chicken run? And if anyone has anytips on how to build a safe chicken run please share. I want to keep my babies safe.

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Dog kennels will work fine buy you will need to address the tops to keep out hawks and owls or climbing animals like coon and you need to cover the bottoms to prevent small weasels from getting through and coon from reaching through and pulling the birds out through the kennel
I am planning on doing something like this. It isn't as cost efficient as other things but I think it looks cleaner plus nothing isnt permanent like pouring concrete. We did something like this for our dogs and it has kept them from trying to dig out. Should keep predators from digging in. Any thoughts?