Does anyone use a treadmill to condition/exercise their dogs? How did you go about training it? How long/often do you run your dog? How long have you been using it? I just picked on up off of craigslist for pretty cheap with the intentions of using it to keep the dogs conditioned throughout the winter (mostly Zuma this year, Zinga is a baby still) because as much as I don't mind the winter, the shorter days cut into our outdoor time. I need to keep them conditioned though because we will still be doing disc/agility throughout the year and I can't risk them injuring themselves do to being unfit.