DH is in charge of this one, but in the summertime, they get it with the hose outside. The lab loves it, the sheltie, well, not so much.
In the wintertime, the lab gets a shower in our upstairs bathroom, and the sheltie goes to the IL's and gets a bath in their laundry tub.
Our lab loves his shower, he will get into the bathtub upstairs and start digging like crazy, and he whines and looks up at the shower head, as if to say, "Please spray me, please". It's funny, but he has scratched the finish on the tub.