Denver's most popular dog breed

• Chihuahuas came in second, followed by the Labrador retriever.

Driving the news: Tuesday marks National Dog Day.

The fine print: The annual nationwide report relies on pet insurance data, so it doesn't account for all dogs in the country.

• Last year, the chihuahua was No. 1 in the U.S., but analysts had separated "Labs" (then No. 2) and "black Labs" (then No. 10) into separate categories. This year, the Labrador category includes labs of all colors.

Zoom out: Statewide, Denver's top breeds also dominate, though Labradors were slightly more popular than Chihuahuas.

Between the lines: It's tricky to track mutt popularity.

• The study counted "mixed breed," "pit bull" and labels like "German shepherd mix" as separate categories. The goldendoodle was the only mixed breed to crack the top 10.

Go deeper: Dog surrenders are soaring at Denver Animal Shelter