Dog kennel floor
Placing your dogon a floor that isn't suitable will only cause you bigger problems later on. Haphazardly choosing a site for your new dog is not recommendable in the least as a dog floor is very important to the comfort, health and happiness of your dog not to mention the effects that it will have on you and the way it could look and smell if you do not put the proper work into it in the beginning.
If you can't lay a cement floor for your dog you could build a concrete paved block and border it with crushed stones.
But whatever size your dogis, you should always build some kind of dog at one end which will of course take up some surface area and then you could use blocks for half of it and then leave the rest with plain crushed plain stone. The thing that you are shooting for is what is best for you and your dog and what you will be able to keep the pen clean and disinfected so it is pleasant to the eye and nose. Keep any kennels locked at all times to avoid thieves from stealing you dog. Leaving your dog all alone for long periods of time is not the most recommendable thing however we all know that sometimes this cannot be avoided.