Didn't you think it was strange that she asked you to watch her dog for a few hours? It's not a child, it's a dog. Dogs are fine on their own for most of the day. You might be asked to let them out or put some food in a bowl in their own house, but people usually do not bring dogs to someone else's house to be babysat like they would children. Your neighbor knew she was not going to be back any time soon. She took advantage of your good nature. It's weird.