This may not work for running - but I use a gentle leader head collar (it is not a muzzle - they can open mouth to pant, drink or bite) when I first teach my dogs to roller blade with me (they love it - they get to run as fast as they want) (I let them set pace - when they stop running full out - we go slower) - but it allows me to keep control and keep them from trying to sniff everything etc without pulling on their vocal cords. When the dog gets used to the run and to ignoring other dogs, squrrells etc. - I sometimes go back to regular collar - it depends on how much dog does not like gentle leader - some of mine have taken to it and others have disliked it.