sound is short and loud
And furry with a cold, wet noise.
Rex is now part of your show, particularly if he went off during dialog. There's nothing quite like a quiet room.
So you're doing something that sartre245 isn't, or other way to. We should get him to post some of the work and see what the differences are.
You can totally have magic problems. For example, many less expensive microphones and microphone systems don't filter low pitch noises (thunder, large lorries, earthquakes and some data errors). In most instances, the rumble doesn't make any difference at all, so why put the expensive filters in? Nobody is willing to pay for them.
The problem is with rumble that comes and goes. You may not be able to hear anything at all, but the Audacity tools and filters may go nuts—when they feel like it. They can hear everything.