Cherry pit

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  Toxic
  Cherry pits are unsafe: choking/obstruction risk and cyanide exposure if crushed.
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• 

  Toxic
  Cherry pits are unsafe and should never be fed.
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• 

  Toxic
  Cherry pits are unsafe and should never be fed.
  Read More
• 

  Toxic
  Cherry pits are unsafe and should never be fed.
  Read More

Sources

• Pet Poison Helpline: Cherry Is Toxic To Dogs
• ASPCA: Toxic and Non-toxic Plants - Cherry
• VCA: Fruits and Vegetables in Birds' Diets
• Rabbit.org: Best Vegetables for Rabbits: A Healthy Diet Guide