You've gotten some great advice. I would simply work on socializing your dog, in every situation you can possibly imagine. Max, my wolfhound, has a high prey drive. He will chase anything that will run. He has never hurt either of my cats. When he catches them, he passes them by and just keeps running. ChiChi also chases them, but does the exact same thing. I feel sure either of them would hurt a strange cat, if they caught it in our yard, but so far, so good. With my bunch, although none of them are known for being dog aggressive breeds, they are all pretty dominant breeds. Typically, the problem with same sex "dog aggression" is simply dominance issues coming to the fore. When you put 2 dominant dogs together, if they are opposite sexes, they will generally work it out. If they are the same sex, one is going to have to submit to the other, in order to resolve the issue. This can be very hard on owners and scary to watch. My guys all gave in to Cody, from the day they met him. There have never been any physical fights between Cody and either of the boys. He has had to literally slam ChiChi and hold her down a few times to make his point with her, before she will submit. She is going to be my "alpha" bitch, without a doubt. If I brought in another dominant bitch, I would most likely have my hands full. I won't, so it isn't a problem. I would take things with your Atlas a day at a time and not buy trouble before I had it. I don't think you will have a problem, but it is not possible to foretell the future. Good luck.
Kathy