Pets are very sweet and affectionate but they are animals and they do not have enough sense of what they are doing.
Usually most of our pets knowingly or unknowingly contaminate most of our furniture which affects our health.
Carpets are the major things which come in contact with the pet for longer time and most of the dogs start drooling or urinating on the carpet leaving it a most dangerous place for the incubating bacteria.
Pet fleas attach themselves to the carpets and keep on infecting the pets. These contaminated carpets can make your home stink and spread infections which include breathing allergies, skin allergies and gastro intestinal problems.
Here is an infograph to avoid this