Working on an annotated bibliography

This is the first time doing an annotated bibliography. It has become quite a challenge as the topic that I have chosen is not an easy one. One of the challenges that I am not finding enough information on my topic. I have come to the conclusion that my subject is too broad and I must narrow it in order to find the information I need. The original topic was improving the standards of animal cruelty in the state of arizona. Since this subject was too broad, I have chosen to research about tethering laws that have been implemented in some states. I think this could be a good subject for the future proposal assignment, as AZ does recognize tethering laws at the time.