how far can a dog smell
Dogs can detect tiny amounts of smell diluted in air, water or far beneath the ground. 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.