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the claim
Spaying or neutering a dog can make the animal less aggressive.
the verdict
CONTESTED
contested - evenly split
Recorded sources
2 sources for · 2 against
Is it true that Spaying or neutering a dog can make the animal less aggressive?
Partly. While some studies indicate that spaying or neutering can reduce certain aggressive behaviors in dogs, other reviews and findings report conflicting results, noting that the procedure can occasionally be associated with increased fear or aggression.
Verdict: CONTESTED · 2 sources for, 2 against · Last checked
The evidence we hold leans evenly split
How this was weighed
official record 3x · fact-check 2x · hedged 1x · crowd & reference 1x
- Influence of Gonadectomy on Canine Behavior · peer-reviewed · supports · weight 1.3 · 2021
- Reproductive Control in Dogs with Emphasis on Anti-GnRH Immu · peer-reviewed · supports · weight 1.05 · 2025
- Dog Neuter, Yes or No? A Summary of the Motivations, Benefit · peer-reviewed · refutes · weight 1.05 · 2025
- Exploring behavioral outcomes of gonadectomy in pets: a need · peer-reviewed · refutes · weight 1 · 2026
Evidence for · 2
This study found a tendency to reduce owner-directed aggression in experimental male dogs following gonadectomy.
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Palestrini, C., Mazzola, S. M., Caione, B., Groppetti, D., Pecile, A. M., Minero, M., & Cannas, S. (2021). Influence of Gonadectomy on Canine Behavior. doi.org. https://doi.org/10.3390/ani11020553
Evidence against · 2
This review highlights that conclusions on behavioral outcomes remain inconclusive, with some studies even suggesting increases in aggression following neutering.
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A, A. & AF, P. (2025). Dog Neuter, Yes or No? A Summary of the Motivations, Benefits, and Harms, with Special Emphasis on the Behavioral Aspect.. doi.org. https://doi.org/10.3390/ani15071063
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More for · 1
Reproductive Control in Dogs with Emphasis on Anti-GnRH Immunocastration and Its Behavioral Effects.
This review notes that immunocastration and reproductive control can decrease behaviors such as roaming, aggression, and sexual mounting.
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MJ, U., M, L., D, S., & L, S. (2025). Reproductive Control in Dogs with Emphasis on Anti-GnRH Immunocastration and Its Behavioral Effects.. doi.org. https://doi.org/10.3390/vetsci13010005
More against · 1
This article emphasizes that the effects of gonadectomy on behavior are contentious, noting that conflicting research suggests neutering may sometimes intensify aggression and anxiety.
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FB, G., RO, B., & M, A. (2026). Exploring behavioral outcomes of gonadectomy in pets: a need for personalized approaches.. doi.org. https://doi.org/10.1590/1984-3143-ar2025-0125
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