I have 2 large dogs, and I've found it really difficult to run with them holding either 2 leashes, or one w/ a splitter. It's awkward, I always feel pulled on way or the other and I don't feel "balanced" when I'm running. I got a waistbelt and 2 short leashes (3 ft each?) and attach one on each side - I find it's much easier, unless of course they pull me over. But truly, they stay next to me, can't get in front of me, my hands are free to be up higher like they normally are when I am dog-less. It's one of the best pieces of running gear I bought.