# In a POST request:
      ...
      parameters:
      - in: body
        name: body
        schema:
          $ref: '#/definitions/animal'
        required: true
      ...
# In a resonse:
      ...
      responses:
        200:
          description: animal response
          schema:
            $ref: '#/definitions/animal'
      ...

# and then create the animal definition:

definitions:
  animal:
    description: animal
    properties:
      animalid:
        description: The animal ID
        type: integer
      animalname:
        description: The animal name
        type: string
    type: object
    required: [ 'animalid', 'animalname' ]