My pup is almost 12 weeks old. In one ear, a lot of dark brown stuff keeps appearing... looks like dirt but I assume it is wax? I cleaned it out twice with a wipe, and again today there is a bunch of dark brown again. She is inside almost always so it is not outside dirt. Any idea what would cause this? Is this something that needs more than cleaning? No bad odor. And the ear is not up all the time yet... some days it is up but most days it is down.