I love dogs, my favourite breed is longhaired German Shepherds. They make excellent Police Dogs and they really seem to enjoy their work.
This photo shows a group of Police Officers from South America somewhere. They have made an arrest and the bad guy has been restrained, they are debating their next step whilst the leader of the pack has a snooze on the criminal.
Some Police force in the US trained sniffer cats for drugs work. They were, they said, every bit as good as the dogs. Getting the cats to actually do some work was not terribly successful. They just refused to do any work. They had too much sleeping to do.