A puppy waits at an adoption event in Miami last year. The city is now considering a ban on the sale of puppies in retail pet stores. Cities and towns in several states have passed similar bans, aimed at cracking down on substandard, large-scale puppy breeders. Wilfredo Lee/AP hide caption

itoggle caption Wilfredo Lee/AP

Kari Neumeyer feeds her dogs, Leo and Mia, a raw food diet supplemented by kibble, which she says is more natural than commercial dog food. Rob Eis/Courtesy of Kari Neumeyer hide caption

itoggle caption Rob Eis/Courtesy of Kari Neumeyer

Courtney Martin jogs through the snow with her dog, Theodore, in St. Louis. Missourians and their pets muddled through another frigid day Tuesday. Jeff Roberson/AP hide caption

itoggle caption Jeff Roberson/AP