Denver at rank 1390 is a city name doing strong work in the pet registry — it carries the wide-open American West in its sound, and on a dog it projects exactly the outdoor-adventure energy that owners want. The name has a particular following among dog owners who actually live in or love Colorado.
The Western City Aesthetic
Denver occupies a specific geographic-cultural slot: it's the gateway to mountain country, associated with hiking culture, skiing, craft breweries, and a relaxed outdoorsy lifestyle. Owners who named their dogs Denver are frequently part of that world — they drive trucks, they go to farmers markets, they take their dogs on trails. Australian Shepherds, Labs, and Border Collies are the breeds most likely to carry a name like this. Male dogs dominate the registry, consistent with the name's M-lean in human use.
Sound Structure
DEN-ver: two syllables, hard stop on the first, falling cadence. It calls well across open terrain, which is perhaps the most appropriate quality in a working-dog name. Austin and Dallas are neighbors in the Western-city naming category. The human name has its own history at /names/denver.
The Counter-Reading
Denver is a strong choice for owners embedded in that Western-outdoors lifestyle, but it can read as a geography statement to everyone who doesn't share it. For dogs in urban environments, the name carries a slight aspirational quality — which may or may not be intentional.