"Dogs' supersensitive noses are legendary, so much so that their approach to life could be summed up as 'sniff first, ask questions later.'” "With 300 million receptors to our mere 5 million, a dog’s nose is estimated to be between 100,000 and 100 million times more sensitive than a human’s."
Entire article at Psychology Today https://www.psychologytoday.com/us/blog/animal-emotions/201902/dogs-should-be-unleashed-sniff-their-noses-content
