We got our cat 6 months ago from a rescue, she's around 4 years old. She's settled in lovely, loves going outside, generally let her out into back garden but she hops the fence to go out the front. It's pretty safe outside for her she mostly stays on our front door step.
Anyway there is a big grey cat from across the road that she has had a fight with 3 times, the first time I was trying to call her in and saw this grey cat on our drive walking slowly closer to her, luckily I filmed it on my phone so I could watch it back, the grey cat went for ours. It's happened twice more since, always on our driveway. What is the best thing to do. Should I/DH knock on the door where we believe it lives to chat to the owner? Realistically what could they do though? I feel worried about ours going out and potentially being attacked and hurt