Plain yogurt (unsweetened)

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  Safe
  Plain, unsweetened yogurt is usually safe as a small treat.
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  Treat
  If tolerated, tiny amounts only.
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  Avoid
  Not suitable for rabbits; avoid dairy products.
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• 

  Treat
  Only tiny occasional amounts for parrots; plain and unsweetened only.
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Sources

• VCA: Feeding Quaker or Monk Parakeets
• VCA: Feeding Meyer's Parrots
• AKC: Can Dogs Eat Yogurt?
• Cornell Feline Health Center: Feeding Your Cat
• House Rabbit Society: Treat Your Bunny Right