http://users.lavalink.com.au/theos/Spay-neuter.htm#s-n

          A listing of the Pros & Cons of Spaying & Neutering

http://www.acc-d.org/2006 Symposium Docs/Duffy2.pdf

          Listed on akc.org.  You will need a username & password to access this file

http://www.naiaonline.org/pdfs/LongTermHealthEffectsOfSpayNeuterInDogs.pdf

          Long-Term Health Risks and Benefits Associated with Spay / Neuter in Dogs

          An article by Laura J. Sanborn, M.S., May 14, 2007