Fortunately in almost 30 years of running DogsI have never crashed:) Most of the time we’re going pretty slow (walking pace 4 to 5 mph) when they pick up the pace I am all over the brakes and prepared for just about anything that being said, of course, anything can happen, but I pride myself on safety:) again I’ve been doing for almost 30 years now running dogs on all different kinds of set ups and I know I’ve been fortunate but also always cautious, so no issues with crashes:)