Spay Day is an annual campaign of The Humane Society of the United States and Humane Society International to inspire people to save animal lives by spaying or neutering pets and feral cats.

Officially the last Tuesday of February, Spay Day includes events and activities taking place throughout February across the United States and U.S. territories, and around the world.

Click here for more information on how to participate in Spay Day 2010.