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A dog is a mammal for the following reasons:

  • It feeds its young on mother's milk - this is the primary reason, and the one, single thing that all mammals share.
  • The young are born live, and not hatched (although there are three species of egg-laying mammals, in the group known as monotremes)
  • It has hair/fur and skin (rather than scales or feathers)
  • It is warm-blooded
  • It breathes through lungs
  • It is a vertebrate (that means it has a backbone)
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8y ago

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