The most microchipped dog by council area (county / unitary authority?). Obviously this is
a) someone's press release to get publicity
b) subject to the number of dogs microchipped
c) first dog past the post
d) subject to anomalies i.e. it is believed that greyhounds being number 1 in Halifax is due to there being a large greyhound and lurcher rescue place there.
But as a metaphor 'Labrador Britain' vs 'Staffie Britain' takes some beating (plus greyhounds as above, Border Collies in, er, the border and Jack Russells in the Celtic fringe)