We rarely do, as despite being double coated and uber fluffy, our girl doesn't seem to attract much muck (she steps round puddles, doesn't like getting wet past her ankles and rarely rolls in anything..bit of a princess!)
I also groom her every other night. However with all the rain she currently smells ..well doggy and so tomorrow when DH is home she will be showered and shampooed. She doesn't like it much but tolerates it with a depressed face.
I'm sure I have read that it isn't good for their coats to be shampooed too often, hence she only gets washed every few months, but I'd be interested to know if this is the case, or whether it's coat dependent. Mine's a double coated Eurasier and she doesn't like the hairdryer so once wet it's HOURS before she stops being soggy even after being towel dried!