The Importance of Dogs in Gerta's Play

Gerta hated dogs so much that she refused to let her husband perform a play with one. He was dismissed from the Grand Duke's theatre, just because he didn't want this dog on the stage. In Gerta's semi-autobiographical novel, there's a play disrupted by irresponsible dog owners. But sounds like Faust where actually Faust always appears as a poodle at one point.