How far can a dog smell?

According to the Marbach Road Animal Hospital, dogs can pick up scents that are diluted to 1 or 2 parts per trillion; This allows them to smell things buried as far as 40 feet underground! In one experiment, a dog was capable of sniffing out whale poop floating in Puget Sound from a mile away, according to Nova. read more

Needless to say, a human's sense of smell pales in comparison to a dogs. Depending on the breed, a dog's sense of smell is 10,000 to 100,000 times better than a human's. While we possess only about 6 million smell receptors, our canine friends can have up to 300 million. read more

How far away dogs can smell depends upon the amounts of scent receptors they have; a number that is differentiated by breed. At the top of the list, with 300 million scent receptors, are the noble bloodhounds, while beagles and German shepherds both sport 225 million. read more

Thankfully, we can’t see this winter wonderland ourselves. But these rafts and scurf, with their biological richness, including the bacteria that sheds with them, are very “visible” to dogs’ noses. 4. You can’t fool your dog’s sense of smell. Research indicates that it’s quite likely that dogs can smell fear, anxiety, even sadness. read more