So that's the reason dogs take so long to find a place to poop...

Searching the entire yard for a half hour is him really trying to find the magnetic pole!

"The theory is that a dog creates a map of scents from odiferous sites like a food store or fertilized garden — or even just a hint of an owner’s scent in the ground or air.
Dogs are especially sensitive to the odor of the humans in their lives. One study used MRI imaging to study activity in the caudate nucleus, a brain area associated with the expectation of a reward."

Oh … and, they are magnetically pooping!