Mac:
If you're looking for scary recorded "shots" check out the Telarc Wellington's Victory album (Beethoven) with 1) digital firework sounds so loud that 2) there is a warning on the label. Normal volume levels will cause immediate ear fatigue and destroy most tweeters.
The Telarc engineers got carried away, you see...
But my canine family knows about the big boxes and sleep behind them when the music is active. Their 'decoration' occurs when I am not looking. On those rare occasions when they have been caught, they were spanked.
But Cavaliers are not a dogsmart breed and do not remember this kind of correction for any length. They are about interpersonal relationships and lap dog love. And they are professionals in these two areas...