He pulls pretty much constantly, but it's not a struggle, he just runs out to the end of his leash, and i'm never moving fast enough to suit the pace he wants to set. The girl dog lags behind; it's a ploy on her part to find and eat garbage on the street before i can stop her. So, i've got the one dog out front, wanting to go faster, and the other lagging behind, hoping that i'll give up and stop watching her. It's a lot of fun. I love both the little doggies, and don't begrudge them their foibles.