Dog owners walk considerably more that those who don't own a dog
From this New York Times article, Forget the Treadmill. Get a Dog:
Nearly half of dog walkers exercised an average of 30 minutes a day at least five days a week. By comparison, only about a third of those without dogs got that much regular exercise...
A 2008 study in Western Australia addressed the question when it followed 773 adults who didn’t have dogs. After a year, 92 people, or 12 percent of the group, had acquired a dog. Getting a dog increased average walking by about 30 minutes a week, compared with those who didn’t own dogs…
On average, they exercised about 30 minutes a week more than people who didn’t have dogs.
e to go all out it is a good thing for awhile. After a time the most hardened trainee will suffer from burnout or become over-trained. 

