Hi Emily. You could have found the problem in the carpet.Formalin (formaldehyde gas dissolved in water)is used in making various building materials, and, of course, in embalming bodies.I would get the carpeting changed as soon as possible, if it has the faint odor of formalin, like that noticable when a casket is opened. It may have been part of the dying of the carpet. Bill Olson DVM