Yes, according to this article, researchers have discovered dogs tend to align themselves with the earth's magnetic field when they go potty. After watching 70 dogs poop a grand total of 1,893 times, they determined that dogs prefer to align themselves in a north-south position for eliminating.
So after I read that article, I paid attention to Isaac when he went potty for the rest of the day. He peed three times, all aligned in an east-west position. However, he pooped once and did position himself north-south for that.
I told him he was peeing incorrectly but he did not seem concerned.