Iowa State University Veterinarian Records, RS 22/6/0/9, University Archives, Special Collections Department, Iowa State University, http://www.add.lib.iastate.edu/spcl/arch/rgrp/22-6-0-9.html
A common and potentially serious behavioral problem confronting pet owners and the small animal practitioner is aggression. Of the several types of aggression, dominance aggression is the most common. Over one million people a year are bitten by dogs in the United States alone.
Taphorn, Cathy and Draper, Donald D.
"Canine Dominance Aggression Towards People,"
Iowa State University Veterinarian: Vol. 53
, Article 10.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol53/iss2/10