|Barked: Fri Aug 28, '09 1:24pm PST |
|Testicular cancer only afflicts about 7% of all unaltered male dogs, less than 1% of these based on studies, are so severe that the dog dies as a result; I don't see how 7% is considered one of the top cancers in dogs. Dogs that are exposed to harsh pesticide chemicals and have one or both testicles undescended are at a higher risk of testicular cancer than the average dog. The much more common medical reason to alter a male dog would be to prevent the non-cancerous prostate disorder BPH which about 80% of male dogs over the age of 5 years in the study were afflicted with (for most dogs in the study it causes no problems at all, but for others it caused problems urinating and defecating, and even benign tumors of the prostate; neutering resolves BPH in male dogs), and perenial fistulas (which are more common in older unaltered male dogs than older altered male dogs) which also are common in older unaltered male dogs and are a lot more likely to cause problems than even an enlarged prostate, both are a lot more common of a problem in dogs over 5 years than testicular tumors.
Last I'd seen, the most common cancers in dogs based on research were Lymphosarcoma, Hemangiosarcoma (most common in medium and larger breeds and is more common in altered male dogs than unaltered male dogs, especially in dogs altered prior to 1.5 years of age), Osteosarcoma, Mammary cancer (the risk of this is heavily reduced if the dog is spayed before or right after her first heat and certainly before the third cycle), and Mast Cell cancer.
Many cancer risks are heavily breed and size related, so I personally it's important to evaluate a dog individually when choosing to alter OR not alter based on the basis of canine cancers as long as they can keep the dog from producing unwanted litters if they are to remain unaltered for any period of time after 6 months.
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Ware WA, Hopper, DL. Cardiac Tumors in Dogs: 1982-1995. J Vet Intern Med 1999;13:95–103
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Ettinger, S. Textbook of Veterinary Internal Medicine. W.B. Saunders Co. Philadelphia, PA; 1989.
Rutteman, GR; Withrow, SJ; MacEwen, EG. Tumors of the mammary gland. In Withrow, SJ; MacEwen, EG (eds). Small Animal Clinical Oncology. W.B. Saunders Co. Philadelphia, PA; 2001455-477.
Moe L. Population-based incidence of mammary tumours in some dog breeds. J of Reproduction and Fertility Supplment 57, 439-443
Johnston SD, Kamolpatana K, Root-Kustritz MV, Johnston GR, Prostatic disorders in the dog. Anim Reprod. Sci Jul 2;60-61:405-415
National Canine Cancer Foundation
Edited by author Fri Aug 28, '09 1:26pm PST
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