'scuse my muddled thinking, but if one looking after a dog, then taking it for a daily wander is part and parcel of pet ownership , not farm it out to others, for a 15 minute trot around the block not going to do much for the mutts mental state, they are pack animals, be it a silly 'handbag pooch' or a monstrous junk yard. Hound ,they need more exercise than being dragged around the block.
That's why we have many bad tempered dogs.
I am not a dog owner, as I'm not prepared to be tied down by pet ownership, and being a former 'Postie' I can testify to the mood swings of cooped up mutts,
I might add I used to take the family dog out with me on my rounds, Much against the work rules)