When responders arrived on site they found a bloody scene: Mouse was lying on the ground with his hindquarters suspended in the air and his rear leg caught in the front grill of a heavy-duty truck. Incredibly, Dr. Stott was able to stabilize the horse before he was loaded onto the ambulance and transported to the Prince George's County Equestrian Center.

"When The HSUS first came upon the scene, things were looking dire for Mouse. I did not think he would survive," said Scotlund Haisley, senior director of Emergency Services at The HSUS. "Twelve men and women labored for nearly two hours to untangle Mouse's leg so that he could be transported for further treatment. It is an immense relief to know that this horse is expected to recover from his life-threatening injuries."

The HSUS was joined by a number of volunteers from the International Fund for Animal Welfare, United Animal Nations, the ASPCA, and Noah's Wish.

Click here for more on this story and to watch the rescue video.

Photo: Kate Mitchell of Lexington, Ky., holds Mouse down as officials bandage his leg after he was injured while walking to the Inauguration Day parade. Credit: Kevin Wolf / Associated Press.