This is the sort of thing that would normally put me on defcon 1, but there are considerations: There have been no dog complaints from neighbors, one of those dogs is wearing a collar and none look or act like desperate strays, it happened on Saturday and on no other day. They look like a tourist’s dogs out for a happy romp. And that’s probably what they were.
But for the record, if you go out to the boonies with an unleashed dog you should collar and tag it with its name and a contact number. I’ve hunted them, I’ve buried them, and I’ve rescued them and returned them to their owners. It’s situational – but if I see an uncollared dog around neighbors or poultry I’m probably going to just go ahead and assume the worst.