In Photos: National Puppy Day

The dachshund’s distinctive sausage dog shape comes from being bred to hunt down badgers and get into their setts.

Photograph: Alamy Stock Photo

The ethics of dog breeding have become more complex as technology has progressed. These puppies were cloned in South Korea in 2009 through fat stem cells from a beagle donor. Barbra Streisand recently made headlines by cloning her beloved dog, and now has two young dogs identical to her deceased pet.

Photograph: STR/AFP/Getty Images