What is the best dog breed? The most popular pooches in US since 1880

The American Kennel Club has been tracking the popularity of purebred dogs for 128 years as the number of recognized breeds grew from nine to 177. Here's of the country's most popular dog breeds by the decade, according to data released by the AKC:

3. 1900s: The collie

AP/Samuel Goldwyn Films
June Lockhart, who starred in the TV series "Lassie," from 1958 to 1964 and co-star, Jon Provost, who was Timmy Martin in the series from 1957-1964, appear in this late 1950s promotional photo with Lassie.

The collie debuts at No. 1. The Boston terrier becomes the first small companion dog to reach No. 2.

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