- Dogs' noses have 300 million sensors, compared with a human's 5 million
- Some dogs can detect cancer's unique odors called volatile organic compounds
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Milton Keynes, United Kingdom (CNN)Lucy, a cross between a Labrador retriever and an Irish water spaniel, failed miserably at guide dog school. As she was curious and easily excitable, random scents distracted Lucy from her master's path, and it wasn't long before she was unceremoniously kicked out.