Apple core

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  Avoid
  Core is a choking/obstruction risk and may include seeds.
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• 

  Avoid
  Core is not recommended due to choking and seed exposure risk.
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• 

  Avoid
  Core is not recommended due to choking risk and seed exposure.
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• 

  Avoid
  Core is not recommended; remove seeds and core before feeding apple.
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Sources

• AKC: Can Dogs Eat Apples?
• PetMD: Can Cats Eat Apples?
• House Rabbit Society: Fruits and Vegetables
• VCA: Feeding Meyer's Parrots
• ASPCA: Toxic and Non-toxic Plants - Apple