DUENORTH DOG TRAINING

Best Time to Neuter your Dog

7/17/2020

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Welcome Back to Science Sunday

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Whether or when to neuter dogs and bitches has been on ongoing matter of controversy for as long as the procedures have existed. Given that in the majority of cases whether to neuter is obvious, we will turn our attention to when. Much of the controversy is anecdotal and not based on scientific fact. Others are well documented such as certain cancers and joint disorders.
A 2013 study into Golden Retrievers by the University of California, turned the world of veterinary medicine on its head concerning early spaying and neutering. Early sterilization prevented many issues, according to the study, but also appeared to increase the risk of other diseases, such as cranial cruciate ligament rupture, hemangiosarcoma, mast cell tumors, lymphosarcoma, and hip dysplasia. The study concluded that more studies on the link between sterilization age, breed and the onset of certain diseases also are needed.
Well now those studies have been done. A new study, also from 
University of California, carried out over 10 years involved 35 different dog breeds. From the thousands of dogs examined every year at UC Davis Veterinary Medical Teaching Hospital, the researchers examined 15 years of data to determine whether neutering, the age of neutering, or differences in sex when neutered affect certain cancers and joint disorders across breeds.
Perhaps as may be expected, joint problems were more related to body size than neutering. That being said, there were some surprising statistics emerged  in some breeds. For example, the incidents of cancer in small breeds was found to be low whether neutered or not EXCEPT in Boston terrier and the shih tzu. In those two breeds, there was a significant increase in cancers with neutering. Below is a table copied from the study outlining the recommended age to neuter for the breeds studied. The column in the table labelled "CHOICE"  indicates the age of neutering did have any effect on disease. There was also a comprehensive  breed by breed description in the study which you can see HERE scroll about 1/4 way down for the breed specific descriptions.

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REFERENCES
When should you neuter your dog to avoid health risks?, Scence Daily, July 15,2020
 
Assisting Decision-Making on Age of Neutering for 35 Breeds of Dogs: Associated Joint Disorders, Cancers, and Urinary Incontinence, Frontiers in Vetrinary Science, July 07 2020.
 
WHEN SHOULD I SPAY OR NEUTER MY PET?, AAHA, guidlines
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