Find out who your elected officials are:

View their profiles and voting history:

Recorded roll call votes are rare, so organizations have used a variety of information to create a “scorecard” for legislators in Mass.  You can see an example here.

Animal protection advocacy organizations with a Massachusetts presence:
Massachusetts Animal Coalition
Animal Rescue League of Boston

Email if you know an organization that should be listed.

About changing policies and laws for animals and being an effective advocate:
Get Political For Animals by Julie Lewin
How to Use Social Media for Social Change by Dorie Clark