People who own dogs don’t have dog hair all over their lungs. The respiratory tract is protected by nose hair, so unless inhaled deliberately (such as inhaling vigorously in an area with a lot of dog hair), animal body hair is not easily inhaled into the lungs. Even if it is inhaled, because there are cilia in the trachea and the animal hair is too large, it will still be coughed up and will not stay in the lungs. Any object with a diameter greater than 10 μm (0.01 mm) cannot enter the alveoli, so animal body hair will not directly cause lung damage.

However, it should be noted that if there is too much dog hair in the home, it may cause allergies in some people. It is recommended Clean up dog hair regularly and keep the room clean and hygienic.