Here’s a fun one for the next time your dog does that little spin in the yard: there’s a good chance they’re lining up with the Earth’s magnetic field.
What the researchers found
A team of researchers published a study in 2013 in the journal Frontiers in Zoology. They watched dozens of dogs, across many different breeds, over a period of about two years, and noted which direction each dog was facing when it went to the bathroom.
The result was surprising. When the Earth’s magnetic field was calm, the dogs tended to position themselves along the north-south axis. They mostly avoided facing east or west.
It doesn’t always happen
The pattern showed up when conditions were stable. On days when the magnetic field was less settled, the dogs didn’t show the same preference. That on-and-off pattern is a big part of why the researchers pointed to the magnetic field.
So why do they do it?
Honestly, nobody knows yet. Several animals are known to sense the Earth’s magnetic field, including birds, so the idea isn’t as far-fetched as it sounds. But the “why” is still an open question.
What about the circling?
That’s a separate habit, and the explanations are mostly educated guesses. A popular one is that it’s an old instinct from wild ancestors, who pressed down grass or checked the area before settling in. Your dog probably isn’t going to explain it.
Try it yourself
Next time you’re in the yard, watch which direction your dog faces. A few days of notes might be a surprise. And if you’d rather skip the research and the cleanup, we’ll take care of the yard, whichever direction your dog happens to be facing.