Why do dogs pull? Because there's lots of interesting things out there! And every time we allow our dogs to pull us over to that bush, pole, or fire hydrant the behavior of pulling is being reinforced and growing stronger. Prior to today Mabel has been a puller, but by reinforcing her for being near us she has learned that's a better option. See for yourself.
Jeff Dentler, CPDT-KA, IAABC-ADT, FFCP, CTDI