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If you live in a big city, you've seen them hit the streets with their packs of dogs. Dragged along by four or five leashes, the pet sitter walks the dogs down the busy sidewalks, providing the animals their afternoon exercise while the pet owners are stuck in the office. You may not have realized it, but those dog walkers are probably the owners of thriving businesses. Though a hobby for some, pet sitting is for others a demanding career with many responsibilities.