OMG, why on earth is there even a strap made for that?! I would like to meet whoever created that stupid thing and slap him/her in the face. I thought the purpose of walks with your dog was for you AND the pet to get exercise.
I think I have seen doggy life preservers with handles to pick up the dog. Guess this contraption is a variation on the theme. If I were a tiny dog I would rather be in a stroller if I were too tired to walk.