Photographer Seth Casteel recently released a photo book entitled Underwater Puppies featuring, you guessed it, photos of puppies underwater. While it might seem a bit inhumane to just throw puppies into a pool for the sake of a photo, Casteel sheds light on how he was able to capture the photos of these cute canines:

To create this series, I taught swimming lessons to over 1500 puppies, building their confidence in the water and helping them develop safety and survival skills… Most of the puppies only swam for a few minutes and were not ready for pictures, but some decided to start jumping in on their own and chase after toys!

The book is a follow-up to Casteel’s previous Underwater Dogs. Check out some select photos below. You can find more from Casteel’s “Underwater Puppies” series on his website.

[via Demilked]