I admit it - I do this whenever I have to go out and leave my precious pooch alone, hoping that the sound of either music or the human voice will at least make it seem like someone's still around. 

According to this still somewhat dubious research, it doesn't make any difference, regardless of format. (But I still can't help but wonder what he feels when they play Cat Stevens...)

Do you put the radio on for the dog when you go out? It won’t keep your pet calm, study finds