Gonadectomy and behavior in dogs

It the past few years, there has been a growing interest about the eventual side effects concerning gonadectomy in dogs and bitches. Most publications focus on health problems : obesity, cancers, osteoarticular or ligamentary disorders, longevity. Fewer articles have studied the effect of gonadectomy on behavior. Castration often reduces unwanted behaviors in castrated male dogs, but it may increase some types of agressivity towards other dogs or even humans, depending on the age at neutering.