This is from a medical journal. You know real scientific research, not bullshit articles written by 12 year olds.
Canine aggression and genetic control
This shows that while aggression isn't a gene on its own, there are genetic factors that cause aggression that can be passed on from one generation to the next.
And since you want to brag about your work with the humane society, here is their site confirming exactly what I said. Soooooooo......
Reasons for Aggression in Dogs | Animal Humane Society
And here is more behavioral traits in dogs that are also genetic, including aggression.
DOG BEHAVIORAL GENETICS
So there are three articles, two written by scientist, one by your beloved humane society.