Kase said:
Thats great that she wants to shower, Casey hates bath time.
when she was very little, she hated bath time too. so I told her: as soon as you jump in the bathtub, I give you a treat.
When she had no problem of jumping in the bathtub, I told her: if you can stay in the bathtub, you will have a treat.
Then I began to put some wather in that bathtub, threw some toys in, and keep her play her toys in the water.
Then, she began to play with water, and just love it (no treat is needed anymore, and no shampoo needed).
Now I have one bathroom just for my dogs.