Things Oliver Does Not Approve Of

My dog, Oliver (a Cavalier King Charles Spaniel) occasionally takes offence at music.
Over the last few days, I have observed that he does not like: Steve Reich's Different Trains, Morton Feldman's Bass Clarinet and Percussion and K T Tunstall's Suddenly I See.
Noah (my other Cavalier) has not expressed any opinions regarding music aside from his contribution to a performance class last year when he joined in the last note of a Hindemith saxophone duet.
I'm not sure what to make of all of this.