just use fresh/green trees/branches, and ensure they aren't poisonous.
Our dog chews on our firewood stack in our yard, but we encourage him to chew on green wood, as it is less likely to splinter.
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"You're worried about the team not having enough heart. I'm worried about the team not having enough brains." HFOil fan, August 12th, 2020. E=NG
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