Dogs have been companions to humans for centuries, but little do people know how some of them defied physics, contributed to extremely important scientific discoveries or simply - through the combination of nature and anomalies - stretched our sci-fi imaginations far beyond the limits of even Philip K. Dick. Here's a rundown of some scientific, non-fiction cases of famous dogs that you might not have heard about. 10. Xinxiang, the Runaway Pig Dog It takes a lot to make stoic China flinch…