The pooches are judged based on how closely they meet the traditional standard created by the parent club for their breed, according to the Westminster Kennel Club's official website.
The created standard takes into consideration factors like movement, temperament and physical traits like height and weight, coat and ear shape and placement, the WKC wrote on its site.
But for the average viewer, only one factor matters: cuteness!
Here, we've rounded up the most adorable pups at the show. Who's the cutest? You be the judge!