Does anyone else run with their dog? Willis (the dog) and I will have completed week 4 today and running with him is the best thing I've done in ages. He seems to love it. The only problem I've encountered is that he is really playful and wants to say 'Hi' to every dog he sees so I end up dragging him along when I'm in the middle of a run. Is there anything I should really be considering when I run with him. He's German Shepard / Collie mix, about 2 years old.