This conclusion was drawn by Deborah Wells, a scholar at Queen's University in Belfast. Wells played four kinds of music to the 50 dogs in the kennel: pop songs by famous American singers britney spears and robbie williams, songs from a "Best Classical Music CD", human dialogue on the radio and heavy metal music. After hearing the heavy metal music, the dog was obviously angered and growled loudly for a long time; After listening to classical music, they soon quieted down; The dialogue between pop music and human beings can't seem to arouse their interest.