My dog's diet was accidental changed while she was at the "puppysitter" Now she will not eat her regular dry food. The "puppysitter" mixed "human" food with the dry food. My puppy has never had "human" food. She has had a potty issue all night and won't eat dry food now. She just spits it out. Any advice?

You will find everything you need for the dog in the sticky at https://www.askmehelpdesk.com/dogs/information-articles-our-dogs-expert-labman-53153.html#post254171

As for the sitter, try a sporting good store for a baseball bat.