2 of 9 — Monty: cavalier King Charles spaniel, 6 months Casteel's new book, out Sept. 16, is possibly the only thing cuter than Underwater Dogs: Underwater Puppies. Casteel tells NPR's David Greene ...

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This collection of photos from Seth Casteel features hilarious dogs underwater. We don't usually toss the word "cute" around too often, but sh*t, take a look at Casteel's series, Little Friends ...

The animal lovers at Maymo watch dogs paw at a curious octopus while encountering a shark underwater, blending underwater suspense with hilarious furball antics. Donald Trump's approval rating breaks ...

DECATUR, Ill. | Since Decatur native Seth Casteel's underwater dog photography first went viral online in February, his life has essentially turned inside out. He went from just trying to make a ...