Most dogs like a surface that is a little bit raised to lay on so I use pallets with solid tops or closley spaced slats in the areas where they like to lay. In the kennel runs and tie outs the dogs like to lay on top of their flat topped dog houses. The only dog I have with calluses is one house dog that is a complete "futon ranger". I have a feeling going by photos you have posted that old skids might not fit in your neighbourhood's decorating scheme... - so you could just build a nice fancy wooden platform...
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My name is Melis. Developing web platform which simplify dog kennel reservations for dog parents. Dog parents will be able to book rooms in kennel just like they book room for themselves. Rates will be same as you book directly.
Dog Kennel and Dog Run Flooring from K9 Kennel Store - Pinterest
Kennel Deck is the perfect solution to providing a sanitary, yet comfortable surface for dogs in cages, runs, and more. Kennel Deck's platform flooring system for pets provides a clean and proper solution for all types of dogs or other animals in a kennel or dog cage.
Kennel Deck Kennel Platforms -- 6 PACK