Great and doable advice from HSUS. Those of us who know and care, we need to band together, not to judge and do nothing, but to take action, when we can, teach and lead others by our example.
HSUS Advice (Save this infographic or add this link to your bookmarks):
Take down the car's make, model, and license plate number.
If this is a retail or restaurant establishment's parking lot or event venue ask a decision maker or security personnel to make a public announcement.
Call the authorities - have the numbers in your directory.
Safe Keeping. Well Being.