Nuture over nature in my opinion. Dogs are like people in that childhood trauma never really goes away. If a dog was mistreated at any point in their life. Eve

Nuture over nature in my opinion. Dogs are like people in that childhood trauma never really goes away. If a dog was mistreated at any point in their life. Even before you owned the dog years ago, it could manifest in aggression. We had a dog growing up, medium sized poodle mix, that we had adopted at one year and were told had been abused by the husband. Not typically an aggressive dog. However certain unfamiliar men, not all men, but some skinny, white men it seemed were liable to be met with aggression and family guarding behavior. Every dog I have raised since puppyhood, including a 115 pound mixed breed and a 100 pound husky have had zero aggression issues. That is not to say one can be careless. There is always the chance, and you have to have the space and be able to handle any dog you own.