The answer to 'why is my dryer vent pet stains' is that pet hair and dander can build up in the dryer vent over time, leading to clogged and dirty vents. This is a common issue for homeowners with pets, as the lint and debris from pet fur can accumulate in the vent and cause problems.
Some common symptoms of a pet-stained dryer vent include reduced airflow, longer drying times, and a musty or unpleasant odor coming from the vent. In severe cases, the buildup can even become a fire hazard. To address this problem, you'll need to regularly clean and maintain the dryer vent to remove any pet-related debris.