Wow, they are moving right along! What a fun video, lol. My 4 have to stop and sniff every few steps.

I don't permit mine to pull, and most often they are fanned out behind me.

Aren't couplers great?! I have one but only use it sometimes. I always have walked all 4 together!

Just an FYI there are a few other styles I want to try, know friends who have these:
http://www.jbpet.com/multiple-dog-leads.html

The Leash Walker Plus gives each dog more leeway than a coupler system
http://www.jbpet.com/Pet-Walker-Plus...eash,1437.html

And the buddy system lets you walk hands free. Someone in my rescue has this and the add ons to walk 5 dogs. She loves it! I haven't bought one yet as I worry my crew will tangle up with each other. She swears they learn not to really quickly.
http://www.thesensibledog.com/buddysystemleash.html