Carpets collect dirt, dust, sand and dead skin cells on a regular basis. If you have children, then your floor coverings are prone to accidental spills from milk, juice and other liquids. Pet dander is another problem you would have to deal with if you have a four-legged friend living in your household. Dogs and cats love to play in the backyard and might go inside your house with mud on their paws and walk all over your carpets, or they might unintentionally pee or poop. Another huge mess thrown at you.