I’ll echo what others have said.
I had a husky for a long time, and man did she have a crazy prey drive. It was limited to smaller prey…she’d grab birds out of the air, killed a few ducks, squirrels, and my parent’s cat. We built a dog-proof yard on our farm specifically for her. Because in addition to the high prey drive, if they are loose they’ll roam a lot farther than other breeds. IIRC, most dogs will stay within a 1 mile perimeter of their home where huskies will go ~50 miles. It was certainly true for ours. If she got out she was GONE and you had to figure out how to get in front of her to get her to stop. She was hell on wheels and I was always worried that she’d get out and kill someone else’s animal. I never worried that she would hurt a person though - she was as gentle as a dog can be with humans.
With that being said, I would be hugely uncomfortable with 3 dogs of any type coming onto my property regardless of breed. I’ve seen the cutest fluffiest lap-dog-type breeds become feral acting in a pack mentality. In the neighborhood I grew up in, a group of 4 or 5 medium sized pet dogs (sheltie, lab, and a few others) chased down and mauled another neighbor’s shih tzu while she was walking him.
People who let their dogs roam around other peoples’ properties make me really angry. It’s so inconsiderate to the neighbors and the dogs alike. I agree that you ought to see if you can get them locked up in a stall if you see them around again and ask animal control to come pick them up.