Research on the Effects of Spaying and Neutering

by | Breeding, Canine Fitness, Dog Health

There is a growing body of research showing that spaying and neutering dogs is not the innocuous surgery once thought. To help you determine if and when you should spay or neuter your dog, here is a collection of research on the long-term effects of these surgeries, as well as information some of the conditions complicated by a dog’s status, from breast or mammary cancer to incontinence. Hope you find this valuable.


This large, comprehensive study of the relationships between spaying/neutering and aggressive behavior in dogs demonstrates that when the many factors affecting aggressive behavior are considered, there is no evidence that spaying and neutering at any age reduces aggressive behavior toward familiar people or dogs, and there is a minimal increase in aggression toward strangers. Given the increasing evidence of significant negative health effects of spaying/neutering, there is an urgent need to systematically examine other means of preventing unwanted procreation, such as vasectomy and hysterectomy.

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