- Dogs can smell about 1,000 times better than humans. A human has about five million smell-detecting cells, while the average dog has more than 220 million. The part of the brain that interprets all this information is four times larger in dogs than in humans.
- Some dogs can smell dead bodies under water. They can smell where termites are hiding, and natural gas buried under 40 feet of dirt.
- Trained dogs can detect cancer too small to be detected by medical equipment, and can find lung cancer through sniffing a person's breath.
- Dog nose prints are as unique as human finger prints, and can be used to identify them.
- A dog's nose being wet means it can collect more of the tiny droplets of smelly chemicals in the air.
Besides the nose, a pair of average dog ears also outclass humans. A dog can locate the source of a sound in 1/600 of a seconds, and can hear sounds four times further away than a human.