You’ve read all of your free items this month. To register, get added benefits and unlimited access to articles, Become a Member. Already a Member? Sign in. Advertising Age Article Abstract Purina Joins Pack of Marketers Turned Content Aggregators In a World of LOLCats and Crazy Dogs, PetCharts Promises to Help Visitors Find the Pick of the Litter By Abbey Klaassen, Published on April 14, 2008 1 Want more Access, Content & Connections? Upgrade to Membership. We are glad you are enjoying Advertising Age. To get uninterrupted access and additional benefits, become a member today. Register Now Already a member? Log in.