@lyndas Will you dog ever have access to females in heat? Will your dog be unsupervised outside? Will you neuter if your dog is engaging obsessively in hormonally driven behaviors?
Males really don't need to be neutered if they are well behaved and appropriately managed and supervised. You are not significantly reducing the risk of any cancers or diseases.
Apologies for broken links, old list that I need to update!
*Spay, Neuter And Joint Disease
http://www.dogsnaturallymagazine.com/spay-neuter-and-joint-disease/
*Long term effects, which clearly outlines the pros/cons-
http://www.naiaonline.org/pdfs/LongTermHealthEffectsOfSpayNeuterInDogs.pdf
*Considerations, including increase in fears, sound sensitivity, and aggression-
http://www.caninesports.com/uploads/1/5/3/1/15319800/earlyspayconsiderations.pdf
*Concerning aggression and fearful dogs-
http://www.doglistener.co.uk/neutering/spaying_neutering.shtml
*Behavior and physical affects, which shows the correlation between neutering and increased aggression-
http://www.sccgov.org/keyboard/atta...l 19, 2011/203472591/TMPKeyboard203477047.pdf
*Increase in bone cancer-
http://cebp.aacrjournals.org/content/11/11/1434.full
*Neutering Dogs: Effects on Joint Disorders and Cancers in Golden Retrievers
http://www.plosone.org/article/info:doi/10.1371/journal.pone.0055937
*Your Dog Needs To Be Spayed Or Neutered – Right?
http://www.dogsnaturallymagazine.com/your-dog-needs-to-be-spayed-or-neutered-right/
*Veterinarian Karen Becker, "Why I've Had a Change of Heart About Neutering Pets" including traditional spay/neuter desexing vs. sterilization
http://healthypets.mercola.com/sites/healthypets/archive/2013/09/30/neutering-health-risks.aspx
*Effects of ovariohysterectomy on reactivity in German Shepherd dogs
http://www.sciencedirect.com/science/article/pii/S109002330500064X
*Evaluation of the risk and age of onset of cancer and behavioral disorders in gonadectomized Vizslas
http://www.ncbi.nlm.nih.gov/pubmed/24432963
The Vizsla study involved 2,505 dogs, and reported these results:
• Dogs neutered or spayed at any age were at significantly increased risk for developing mast cell cancer, lymphoma, all other cancers, all cancers combined, and fear of storms, compared with intact dogs.
• Females spayed at 12 months or younger, and both genders neutered or spayed at over 12 months had significantly increased odds of developing hemangiosarcoma, compared with intact dogs.
• Dogs of both genders neutered or spayed at 6 months or younger had significantly increased odds of developing a behavioral disorder, including separation anxiety, noise phobia, timidity, excitability, submissive urination, aggression, hyperactivity, and/or fear biting. When it came to thunderstorm phobia, all neutered or spayed Vizslas were at greater risk than intact Vizslas, regardless of age at neutering.
• The younger the age at neutering, the earlier the age at diagnosis with mast cell cancer, cancers other than mast cell, hemangiosarcoma, lymphoma, all cancers combined, a behavioral disorder, or fear of storms.
• Compared to intact dogs, neutered and spayed dogs had a 3.5 times higher risk of developing mast cell cancer, regardless of what age they were neutered.
• Spayed females had nine times higher incidence of hemangiosarcoma compared to intact females, regardless of when spaying was performed, however, no difference in incidence of this type of cancer was found for neutered vs. intact males.
• Neutered and spayed dogs had 4.3 times higher incidence of lymphoma (lymphosarcoma), regardless of age at time of neutering.
• Neutered and spayed dogs had five times higher incidence of other types of cancer, regardless of age of neutering.
Spayed females had 6.5 times higher incidence of all cancers combined compared to intact females, and neutered males had 3.6 times higher incidence than intact males.