example_of_inheritance.rb

module Pets
  
  class Dog
    
    def bark
      raise 'Calling the abstract pet'
    end
    
  end
  
  class Husky < Dog
    
    def bark
      'WOOOOF'
    end
    
  end
  
  
  class Chihuahua < Dog
    def bark
      'Yiiiip'
    end
  end
    
end