If you see someone abuse an animal, have pen and paper ready to document details, such as license plate numbers and vehicle descriptions. Call your local animal shelter, animal control, SPCA, or the police immediately. If they do not respond quickly, call PETA. Try to get evidence (take photos or video), find witnesses, and provide authorities with a written description of the abuse that you witnessed. You can also go to your local magistrate or police commissioner and file a formal complaint.