Eating Poop

My dog is just so incredibly gross at times. It is just horrible ... I just let her out because she was driving me up the wall and it is not raining or cold outside and I just look out the window to make sure she is ok and she is eating poop. Now I clean up the yard quite well and quite often so she much have been searching for this one. But that is just gross. I mean do all dogs do this? My old dog never did this weird behavior.