require 'open-uri'
require 'nokogiri'

url = 'http://www.petsonic.com/es/perros/snacks-y-huesos-perro/galletas-granja-para-perro'
html = open(url)

doc = Nokogiri::HTML(html)

names = []
doc.xpath('//div[@class = "attribute_list"]/*' ).each do |row|


    tempName = row.at_xpath('//span[@class = "attribute_name"]')
    tempPrice = row.at_xpath('//span[@class = "attribute_price"]')

    puts tempName
    puts tempPrice
end

//span[@class = "attribute_name"]

//span[@class = "attribute_price"]