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
Wounds occur so frequently in animals that their proper treatment is one of the most important subjects in veterinary surgery. A wound is a break in the continuity of tissue in any part of the body and is usually produced by an external instrument. When a wound is made by a sharp instrument the edges are smooth and there is little damage to the tissue. If the wound is made by a blunt instrument, the skin mayor may not be broken. The trauma of the tissues produces a bruising of the tissue with rupture of the capillaries, small arteries, veins and lymphatics. The escape of blood and lymph into the tissues produces a swelling that varies with the size of the tissue and degree of traumatism.
Frank, E. R.
"Wounds and Their Treatment,"
Iowa State University Veterinarian: Vol. 9
, Article 2.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol9/iss2/2