Are Desexed Dogs Harder To Train?

Updated April 13, 2021

One of the common arguments for not desexing a dog is the effect on their trainability, especially herding, guarding or protection. But does this really happen?

This question is not just relevant to the police, military or farming sectors. It matters to all of us who want a well-behaved dog.

The main debate is of course with male dogs. To this day, you will see that most protective and guard dogs around the world are not castrated. Now for the first time, a research paper has specifically looked at this question.

Working Dogs & Neutering: The Evidence

Young adult male military dogs in Switzerland were either left ‘intact’ or given a hormonal implant called Suprelorin that blocks testosterone production. This gives the same result as castration, except chemically not surgically.

Then they were given these tests:

ObedienceWalk on a leash, walk off leash, positions (sit / lay down), reaction to gunshot, walk through a group of people, recall with distraction, down- stay for 5min
ProtectionAttack towards a human, chase an attacker, recall from the attacker
SocialWalk in town; reaction to people, dogs, cars and bicycles; train ride
BuildingSearch, barking, entering building, successful finding

The results? Castration had no measurable effect on any of the results.

This may surprise you, but it’s exactly what I would have expected. A 2005 study of trainability in 11 common breeds found the same thing for 9, and an improvement after desexing in the other two. These were Rottweilers and Shetland Sheepdogs.

It also fits well with our theories of dog learning. Studies in wolves have repeatedly shown how badly they train compared with domestic dogs. Trainability is a genetic trait that humans have selected, not something ‘natural’. Why should it be affected by sex or neuter status?

How well a dog works is far more likely to be governed by the quality of the training and reward techniques being used. These dogs may be showing aggression while working, but this aggression isn’t hormonal, it’s learnt.

Not only does this news give us a whole lot of new respect for dogs (what, more?), it also gives us the freedom to neuter based on a dog’s needs. These same results are likely to be equally as applicable to farm dogs or even your dog training classes.

Related: Desexing & Human-Directed Aggression | Why Desex Male Dogs?

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By Andrew Spanner BVSc(Hons) MVetStud, a vet in Adelaide, Australia. These articles are from a series regularly posted on email and Twitter. Subscribe via email here to never miss a story!


Gfrerer, N., Taborsky, M., & Würbel, H. (2019). No evidence for detrimental effect of chemical castration on working ability in Swiss military dogs. Applied animal behaviour science211, 84-87

Serpell, J. A., & Hsu, Y. A. (2005). Effects of breed, sex, and neuter status on trainability in dogs. Anthrozoös18(3), 196-207


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