With our current pup, we have bathed him a little more than I would like. Mostly trying to keep his unmentionables clean and he likes rolling in the dirt, snow, water, and anything else he can get into.
Our last adult we bathed when she was extremely dirty or starting to stink. That consisted of a couple-3 times a year or so.
There is a thread on this somewhere....
Dagr "Dag" 11/07/2013-