I have never approved of using dogs in law enforcement. Seen too many sketchy things with them.
How are you going to run a prison camp without bloodhounds to track the runners through the woods and swamps?
Then, of course, there is identification testimony from dogs. "Thirty-seven states and the District of Columbia admit scent-tracking evidence to prove the identity of the accused, provided a proper foundation is laid." Winston v. State, Texas Ct. Crim. App 2002.