By Dr. Mary Fuller Every day, all over the world, dogs repeat the same ritual: Nose to the ground, they sniff along a dotted line of an invisible treasure map, stopping at that "X" marks the spot where they can finally get down to business. What's with all this sniffing, anyway?
Weimaraner sniffing the ground
The simple answer: It's the way dogs have been communicating with one another for centuries.
Scent Marking Is Serious Business
Scent marking is an instinctual behavior in which a dog deposits his own odor - in the form of urine or feces - onto his environment to mark territory or make a statement.
Other dogs who come upon the scent can discern a lot about fellow canines in the neighborhood. With one whiff of urine, a pup can determine how many dogs have been there, how long ago they were in the area and, best of all, if there's a female in heat nearby.
Since dogs can also express their anal glands when scared, the scent may also serve to alert other dogs to danger. On a more mundane level, dogs may just sniff the feces to determine what another canine has recently eaten, telling them that ingestible goodies may be close at hand.