1.   An equal number of people are sensitive to dog dander, but dog allergens seem to cause fewer symptoms.

2.   Once a fleck of dog dander, a remnant from a pet-owner who previously had his seat, sparked an attack.

3.   The Gallos knew that allergies were caused by dog dander, or flakes of skin, and not hair.

4.   There is suggestive evidence, but not proof, that mold, dog dander and pollution from poorly burning gas stoves also play a role in worsening asthma.