The False Alarm button in the Broken Bookmark window should be used to mark a site which is working to your satisfaction but returns a status code indicating an error. Although Bookdog does know the patterns of some common mistakes made by webmasters resulting in "false alarms" and ignores them, it's a wild, world-wide web out there, and no one has seen everything. When you click this button, Bookdog will remember this one as OK and no longer show it as a Broken Bookmark. However, remember that the error may be temporary, and therefore it is recommended to click Next until it has proven itself to be a persistent nuisance.
Bookdog remembers False Alarms as an attribute which you may later set or clear. It is editable as a checkbox in the Inspector panel. You can display a list all bookmarks that are marked False Alarm by searching for this attribute value in the Find window. Clicking menu > Maintain > False Alarms performs this with one click.
Bookmarks which you have marked as False Alarms will also be skipped during future Verify operations, and will never have their URLs changed by Bookdog, even if the website returns a 301 "Moved Permanently" message. Thus, False Alarm may also be thought of as Don't Verify and Don't Ever Change My URL.