Interesting fact:

You can’t celebrate spies without celebrating those that catch them. One particularly interesting spy-catcher was Sergeant Stubby, an American war dog. Yep. He was the only war dog to be promoted to the rank of sergeant through combat in WW1. His heroic acts saved his regiment from numerous mustard gas attacks, he famously comforted wounded soldiers, and on one occasion caught a German spy and held onto the seat of his trousers until American soldiers found him. Good boy.