A friend of mine shoots in his backyard. He's an NFAA national champ in barebow and practices at 60 yards. Without getting too detailed, his dog reacted to the arrow flight (not the bow or the target).

I learned alot about bow noise when I bought a house with a basement and concrete walls. The sound bounces off the walls like you cannot imagine. My hunting bow is quiet and my target bow is a little bit louder when fired outside. I shot both in my basement and was shocked at how loud both bows were. After adding limb savers to both bows I can tell you truthfully ... no matter how quiet you think your bow is - add limb savers.