animal_shelter.rb

 # Define Animal as a class
class Animal

  # Set up accessors and mutators for the attributes of an Animal
  # attr_accessor sets up both for you
  attr_accessor :name, :age, :gender, :species, :toys

  # Used when creating a new animal.
  #   Example:
  #       Animal.new('Timmy', 4, 'male', 'toad')
  def initialize(name, age, gender, species)
    @name = name
    @age = age
    @gender = gender
    @species = species
    @toys = []
  end

  # When we display the animal using puts or print, the
  #   to_s method is called to pretty print an Animal
  def to_s
    "#{@name} is a #{@age} year old #{@gender} #{@species} that loves #{@toys.join(', ')}"
  end
end

class Shelter
  attr_accessor :name, :address, :animals

  def initialize(name, address)
    @name = name
    @address = address
    @animals = {}
  end

  def display_animals
    @animals.values.join("\n")
  end

  def to_s
    "#{@name} shelter at #{@address} has #{@animals.count} animals."
  end
end