(Seth Casteel/LittleFriendsPhoto.com)

Seth Casteel has a passion for pets and his work as a photographer lets him show it off in an unusual way. His photo series of dogs underwater has captivated the web and has been featured by CNN, NBC's Today, Good Morning America and Jeopardy!

Based in Chicago and Los Angeles, Casteel's "Little Friends Photography" studio specializes in lifestyle pet photography. The award-winning photographer writes on his studio's Facebook page that the images embrace "the at-ease mentality of pets on location in the natural surroundings."

More photos can be seen in his book "Underwater Dogs," released in October 2012.

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