Bark

On pavements and the bark of trees I have found whole new worlds.

~ Mark Tobey

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Dogs treat tree bark the same way human beings treat beef jerky. Tree bark and beef jerky look similar and feel kind of the same when you touch them. And, just like when dogs chew on tree bark, we also lie on our stomachs outside and don't actually eat beef jerky, but shred it up and leave it in bitlets on the ground.