Ah! Well! That's a touchy subject.
When we got them I was recovering from an Op so Steve did most of the walkies with them together.
They walk fine if taken out one by one but together is proving tricky if we take one each. It's a contest; both want to be the one in front. If Amber is behind she howls, Molly just pulls until her eyeballs bulge.
We are back to the training, walking each individually but together on the lead round the garden - it's, erm, fun?