Underwater Puppies is lifestyle pet photographer Seth Casteel's sequel to his 2012 New York Times best-selling book Underwater Dogs . Casteel got started in photography in 2007 when he volunteered to take better photos of shelter dogs and cats to help them get adopted, with many of the puppies in his current book being rescue dogs as well.

Underwater Puppies comes out on September 16.

(h/t NPR )

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