Dander is an informal term for a material shed from the body of various animals, similar to dandruff. It is composed of skin cells. It is a cause of allergies in humans. Older etymology has it that dander is a rare (perhaps Yorkshire) synonym of dandruff (OED). In the idiom "getting one's dander up" the colloquial meaning, anger, is probably unrelated to the above usage.
Pet dander is generally worse in older animals than in younger animals, as older animals slough off more skin cells than younger animals. Dander is microscopic, and can be transported through the air. Through the air, dander can
enter the mucous membranes in the lungs, causing allergies to some individuals. Skin flakes that come off the main body of an animal are dander while the flakes of skin called dandruff come from the scalp.
Pet dander is generally worse in older animals than in younger animals, as older animals slough off more skin cells than younger animals. Dander is microscopic, and can be transported through the air. Through the air, dander can
enter the mucous membranes in the lungs, causing allergies to some individuals. Skin flakes that come off the main body of an animal are dander while the flakes of skin called dandruff come from the scalp.
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