Chams have very small holes for ears, practically naked to the human eye. They can't hear well, they listen to vibrations and tones and rely on sight to hunt. The dog wont be a problem unless it is at the cage frightening the Cham, barking or not.
I have a surround sound system that sounds like an IMAX movie theater in the room where my Cham is housed and play my movies loud. No problem.
Correct me if I am wrong more experienced owners, but I believe this is what I have been told cause I was worried about the sound problem as well as a new owner