small scales from animal skins or hair or bird feathers that can cause allergic reactions in some people
a feeling of anger and animosity;
"having one's hackles or dander up"
- The children get the teacher's dander up when they make a lot of noise.
- One view is that allergies can develop as the result of childhood exposure to certain irritants, such as dust or animal dander, while the immune system is not yet mature.