gistfile1.rb

class Owner
  def initialize(preferred_dog_name = "unknown")
    @preferred_dog_name = preferred_dog_name
  end

  def dog_name
    "my favourite dog is #{@preferred_dog_name}"
  end
end

class Emo < Owner
  def initialize(preferred_dog_name = "Bill"); super; end
end

class Nerd < Owner
  def initialize(preferred_dog_name = "R2-D2"); super; end

  def dog_name
    "MY F@V0URIT3 d0g 1s #{@preferred_dog_name}"
  end
end

class Hater < Owner; end

emo = Emo.new
nerd = Nerd.new
hater = Hater.new

puts "Emo dog name : #{emo.dog_name}"
puts "Nerd dog name : #{nerd.dog_name}"
puts "Hater dog name : #{hater.dog_name}"

# Emo dog name : my favourite dog is Bill
# Nerd dog name : MY F@V0URIT3 d0g 1s R2-D2
# Hater dog name : my favourite dog is unknown