There's one thing, however, that German shepherds can't do as police dogs.
They can't change our perceptions of one breed who badly needs an image makeover: the pit bull.
And by pit bull, we mean that loose and very vague label people have come to use for a wide variety of square-faced dogs - like American pit bull terriers, American Staffordshire terriers, Staffordshire bull terriers and mixes of any of these dogs.
It seems that, regardless of how many stories we hear about gentle, loving pit bulls, there are all too many more of them being miscast as a menace.
That's why the world's police departments need more pit bulls. And it looks like they may be getting them. The best part? Many of these dogs are saved from spending their final days in a shelter. That's vital, because pit bulls are overbred in dizzying abundance. As a result, more than 2,000 pit bulls are euthanized in the U.S. every day.
Instead of being bred for the role, pit bulls are promoted from the dark days of shelter life to crime-fighting companions of humans who grow powerfully attached to them.
We don't know if this is a trend. There's no recorded data of how many departments employ pit bulls, but we are seeing some refreshing new faces on patrol across the country.
There's Libby, who joined Montgomery County's narcotics team in Texas back in May.