A study published this week in the journal Frontiers in Zoology suggests that dogs choose to relieve themselves along a north-south axis in line with Earth's magnetic field.
The Motherboard blog reported on the study's findings, saying that the research was carried out by a team of Czech and German scientists.
MORE: http://www.rawstory.com/rs/2014/01/02/dogs-poop-in-line-with-earths-magnetic-field-says-study/