What can I use as a crate bed/mat that is really difficult for my golden retriever to chew up?

He had a kong bed but chewed a hole through that.

submitted by /u/dmbdrummer21
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from Pets https://www.reddit.com/r/Pets/comments/c3oz5m/what_can_i_use_as_a_crate_bedmat_that_is_really/