+28 votes
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2 Answers

+4 votes
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  • Cinnamon.
  • Citrus (d-limonene)
  • Pennyroyal.
  • Peppermint.
  • Pine.
  • Sweet birch.
  • Tea tree (melaleuca)
  • Wintergreen.
+6 votes
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Additionally, some essential oils themselves are poisonous to dogs.

This includes oil of cinnamon, citrus, pennyroyal, peppermint, pine, sweet birch, tea tree (melaleuca), wintergreen, and ylang ylang.

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