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I usually recommend noindexing search results pages, since Google has said they don't want "search results in their search results." I was thinking about this this morning and I think one way to go would be to give advice on owning a dog in different areas of the city. For example you could say something like "In the City of London, the area is more urban and green spaces are fewer and far between. Dog owners in the City should expect to take their pups to a dog park for some regular exercise, and may want to consider smaller, lower-energy breeds who don't need as much time to run." Something like that. You could talk about nearby parks and dog-friendly attractions, endorse some local vets, list nearby pet hospitals, that sort of thing. It will take time to build out this content, but you can prioritize based on the existing organic traffic each page is getting, or start with your top converters and go from there.