Will Spaying A Dog Make Her Less Agressive. Neutered or spayed animals also have a longer life expectancy. According to anasazi animal clinic, you may see a change in female dog aggression after spaying.

About the only positive effect on behavior that seems to result from spaying and neutering is the roughly 68. Most controlled scientific studies on this question (and there have been many!) show that whether a dog is spayed or neutered has no impact at all on the likelihood that they will be aggressive in any given circumstance. This, the study suggests, can actually increase the problem, in turn making them more vulnerable to ending up in a shelter.