How can I prevent animals from going under my shed base?


Had a company come to build a base for my plastic shed. The shed base is pretty high off the ground. I am not sure if the shed base should be that high off the ground and if it does, any suggestions how to fill this? I am worried about animals getting under there. I am not happy with the work but I've read that for air flow it should be off the ground. Any suggestions?Really appreciated ..thanks!

q what should i cover the bottom of my shed base with
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