The difference between dog sitting and boarding is the length of stay and attention of care. Dog boarding is like a hotel, where it's typically an overnight stay at a kennel where your dog is around other dogs. On the other hand, a dog sitter will watch your pet at either their or your home, or they may just stop by to care for your pets two or three times per day.
While in-home dog care might feel uncomfortable to some because of giving a stranger access to your home, having someone stop by can be much less intimidating for the dog than having to stay in a crate or small room overnight with other dogs around. If you are one of those dog owners who would rather your dog be in his or her own home while you are out of town, you may want to check out local dog sitters near you.