I walk my two rescues together as I can let Fletch off the lead after 100 yards if local or immediately if in the parks. Pip can't yet go off the lead on normal walks (as he is unreliable and has a squirrel fixation and every tree in Leeds comes with its own squirrel!). However, when both are on the lead, Pip pulls like mad which has made Fletch (who had stopped pulling) start again, although both are getting much better when returning from the walk. But, if one pulls, the other will join in. Bengy, who knew how to walk to heel, did wonders for Fletch - they really do pick things up from each other.
I'm fostering another one next week, so will have to do some seperate walks (not enough arms), unless the foster has wonderful recall off lead. However, my arm muscles are coming along a treat