This is the only time when neither Holly nor her voice actor, Ami Foster, are present.
Charles Adler (uncredited) provided the voice of the Shadow Monster who only appeared twice in Whopper's nightmare in Good Night, Sweet Pups.
Sorrell Booke (uncredited) provided the voice of Officer Edgar in The Rescue Pups. He is the same actor who provided the voice of Mayor Fist in the TV Special.
Julie Payne (uncredited) provided the voice of the 911 Operator in The Rescue Pups. She appeared in many of Jim Davis' Garfield works.