In Arlington, you should visit the dog parks and you will see many, many dog walkers. As a dog owner, I personally have a problem with this. Most of the dog walkers are being paid to exercise the dogs. Many of the dogs are just lying around in the shade, when in reality - they SHOULD be out for individual walks. This would not be so bad *if* the dog walkers paid attention and did not put some of their dogs (or others, i.e.: law suit) at risk.
You will notice one dog walker in particular who sits at the park all day and talks to the visitors. She is known. She is not attentive, and gives commands that the dogs do not know if they are getting into trouble. She does not move from the bench, and often has too many dogs with her. Everyone sees it, and comments on it.
Point being, most of us at the park know who to hire and who not to hire. If it were me, I would prefer someone responsible and energetic that has no problem going around the block a couple times per day, as they are being paid to do.
If this is what you are offering then apparently there is a space for you in the market.
More info.- when we had a dog walker, I believe we paid $5-$10 a visit. Two dogs, one large and one medium. We found we could not trust her if she set the alarm off, as she was too lazy to reset it, and the police issues warnings in those cases. So it became a liability. You have to be somewhat on the ball.
GL OP.