Opening on track genetic?

In my experience with coondogs I would say it's 100% genetic. If I breed an old loose mouth male to my loose mouth female I'm gonna get some loose mouth dogs. Unless a few dogs back I had a tight mouth dog and get a throw back. Or the other way around. Which is always possible. I have also kept a bark collar on a dog all the time in a pen but as soon as he thinks he smells a coon he is opening. Anything can be bred out of a dog over generations of selective breeding. That goes for the good as well as the bad. When selecting a dog based on a trait like how tight a dogs mouth is, always look atleast at the last 3 generations. Better your odds.