Rottweiler might be okay but definitely not Catahoula.I never owned a dog before I had a Rottweiler and had no issues. Rottweilers are calm dogs and observe before they react.
No matter what breed or mix, you need to be consistent when training a dog. All dogs need training and the smaller the more important to train them or you will have to deal with the small dog syndrome. There are many ways now how to train a dog and it will be good to look it up.
And I know a lot about training already. But OP definitely should look it up