Mystery solved!

I've worked out why Tommy always wants me to walk him. Near the sea front are some retirement flats and we always stop and talk at the window with an elderly couple that have a greyhound. I don't know their names, but their dog is called Danny. Today Steve took Tom for a walk and Tommy "guided" Steve to Danny's place. (I did tell Steve my suspicions and where the flat was.) Surprise, surprise when they got home Tom wasn't bothered if I walked him. The little Tinker!