Columbia subject headings:
Dogs in literature.
Literature, Medieval--History and criticism.
Tristan (Legendary character)--Romances--History and criticism.
Harvard subject headings:
Dogs in literature.
Literature, Medieval--History and criticism
Tristan (Legendary character)--Romances--History and criticism.
Princeton subject headings:
Dogs in literature.
Literature, Medieval--History and criticism.
Tristan--Romances--History and criticism.