New research is starting to explain why eczema patients such as Alexander and Casey Richards, 9, itch so much.

新的研究已开始解释像亚历山大和9岁的凯希·理查兹等湿疹患者为什么会痒得这么厉害。

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Casey Giessen recounted how Millan helped explain to the couple how they should go about choosing their future pet.

CNN: 'Dog Whisperer' Cesar Millan on adopting the right dog

"It's really difficult to explain, " an emotional Casey told NBC Television.

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