The answer to 'why is my vacuum pet stains' is that pet stains and odors can be a common issue for vacuum cleaners. Pets can leave behind hair, dander, and urine or fecal matter that can get trapped in the vacuum and cause odors. Over time, these stains and smells can build up and become difficult to remove.
Some common causes include not regularly cleaning the vacuum, using the wrong attachments or settings for pet messes, and not properly maintaining the vacuum filter and bags. Symptoms may include a vacuum that smells bad, poor suction, and visible pet hair and debris in the canister or bag.