While we have about 6 million olfactory receptors, dogs have a staggering 300 million. Their epithelium, or nasal tissue, is about 30 times larger than ours. And while people have between 12 million and 40 million olfactory neurons—specialized cells involved in transmitting odor information to the brain—dogs, depending on the breed, can have 220 million to 2 billion!
thumb_up8thumb_downchat_bubble