Throughout the 1980s and 1990s, Day promoted the annual Spay Day USA, and on a number of occasions, actively lobbied the United States Congress in support of legislation designed to safeguard animal rights. She also founded The Doris Day Animal League. Which was merged into The Humane Society of the United States in 2006. Staff members of the Doris Day League took positions within The HSUS, and Day recorded public service announcements for the organization. The HSUS now manages Spay Day USA, the one-day spay/neuter event she originated.