How do dogs keep cool?

I go out of my way to keep mine cool. It has been so hot here lately my poor babies have been just so uncomfortable. So I came up with a way to keep them cool.

I put down a pad for the floor and wet a towel. As you can see I had no trouble convincing them it was cooler to lay there in front of the fan instead of on the couch beside me. They were taking their turns laying here. But it did the trick to help keep them cool.