While neutering or castrating or de-sexing (removal of the testicles so that male dog can’t breed or sire puppies), may have advantages, a recent study published in PLoS ONE indicate that neutered male dogs are more likely to show aggression and fear-related behavior.
McGreevy PD, Wilson B, Starling MJ, Serpell JA (2018) Behavioural risks in male dogs with minimal lifetime exposure to gonadal hormones may complicate population-control benefits of desexing. PLoS ONE 13(5): e0196284. https://doi.org/10.1371/journal.pone.0196284
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