Why not use small, people friendly dogs? Like "Momo" a certified Japanese Police Dog....


[SIZE="3"]Meet Japan's first police Chihuahua[/SIZE]
Fri Nov 19, 6:43 AM ET
A long-haired Chihuahua named "Momo" (Japanese for "Peach") sits on the grass during an examination to become a police dog in Yamatokoriyama, western Japan November 12, 2010. The brown-and-white Chihuahua, a first for Japan and perhaps the world, was one of 32 successful candidates out of 70 dogs, passing a search and rescue test by finding a person in five minutes after merely sniffing their cap. Picture taken November 12, 2010. To match Reuters Life! JAPAN-CHIHUAHUA/ REUTERS/Kyodo (JAPAN - Tags: ODDLY CRIME LAW ANIMALS)