The bank robbery was going as planned. Now all the thief had to do was make a quick getaway. As he ran outside, however, something large blocked his path. The robber gasped as he looked up. Officer Dave McGrath and his police horse, Dirty Harry, stood in the way. Terrified, the robber surrendered. He knew he couldn't escape from a policeman on a horse! Dirty Harry is just one of thousands of hard-working four-legged cops. Look inside to learn more about police horses and how these heroic animals help keep the streets safe.