I haven't paid, I just clicked no thanks and the article was released. Maybe try that?
Leicester, Derby, Sheffield, Runcorn, Widnes, St Helens, Birmingham, Croydon, and Liverpool seem to be pretty bad with hundreds of dogs clustered across a few areas in each place.
However, there seem to be dozens of dogs in over half the postcodes in England. Where there are between 0-9 dogs no figure is published - but there must be a few in every area an there are 55,000 registered overall.