I used to bath my dog. He never really enjoyed it but once it came drying time he would launch himself in the towel. Not sure why you wouldn't give your dog a bath?
I know it's not particularly good to bathe your dog regularly but once in a while is good. I would bathe my dog when he was really dirty or if someone told me he stunk something awful. Yeah, I need people to tell me because I have no sense of smell.
There was this one time that my dog actually apparently rolled in people feces.
I thought it could have been any kind of metabolic waste but people confirmed it smelled like people feces. Where on earth he found it I couldn't guess!
EDIT: Can you tell what smell it is? Wet dog? Maybe she is blowing off?