Pet Sitter - Full-time / Part-time

We have a springer and a pittie mix. The rescue followed my daughter home from work a few years ago and was clearly neglected and possibly used as a bait dog. He can get fearful, so the trainer we are working with (who is unable to sit this weekend due to her own travel) has offered to facilitate a meet and greet, but she thinks he'd be chiller in his own home. He's a sweet dog, but life on the streets made him untrusting of new situations. He would need somebody who understands the breed and can "read" body language.