A springpole or a treadmill or a historical book on fighting dogs does NOT = evidence of dog fighting, no matter how many times certain humane groups or the media say otherwise.
Springpoles have been painted as an especially ominous 'tool', and we're often told how dog fighters use these things to strengthen the jaws of Pit Bulls. "Pit Bulls are forced to hang with their jaws from ropes dangling from a spring in an effort to strengthen their jaws", a news blurb might 'inform'. Well, the truth of the matter is that a dog cannot be forced to hang from anything they don't want to hang onto, and springpoles have nothing to do with 'strengthening a fighting dog's jaws' and everything to do with fun and appropriate exercise for LOTS of dogs, regardless of breed.
But don't take OUR word for it. Check out this video of a bunch of BORDER COLLIES enjoying their springpole. And yes, that's a Pit Bull guy trying his best to keep up with the springpole pro Collies.