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Intact dogs aren't just exposed to the risk of accidental pregnancy, they also have an increased incidence of cancer and Pyometra (on average, 19% of intact females will suffer this before age 10 ). On top of that, of course, is the disruption to routine that having a season brings: although the dog will still want to play, there's an obvious need to keep them away from males (intact or otherwise: neutered males can still end up fighting over a hormonal bitch).