What I've done in the past is share a link to the particular dashboard you want your end user to see. That way, even if there are 3 or 4 dashboards, the link takes them directly to 'their' dashboard.
Beyond that, you can set user permissions to view/not view dashboards. That would limit it so that Bob can only see dashboard 2 and not 1, 3, and 4.
Hope that helps!