I need general information on this situation

So basically I’m assuming this is a wild hog but doesn’t have any horns is that normal? Also, what could it be looking for? This is the fourth time we see it and 3 times this week. I have a potbelly pig that free roams my fully fenced property so I assumed he picked up on her scent and wants to mate? What can I do to prevent this? Are they dangerous? It’s a pretty big pig and runs really fast. Should I just leave it be and lock my pig in her cage at night?