Why in heavens name does your dog get a shower every day!
She's a very bizzare rescued GSD, she sleeps in the bathroom as the door is the most secure to keep her from eating the cats. The first morning after we had her, I kept her in the bathroom with me, and she decided to join me in the shower... I wasn't going to argue with a 30 kilo dog I didnt really know, who was having the most fun she'd probably had in her life!
Her fur is still shiny, and waterproof, she never has shampoo or anything on it, and gets dried and brushed every day. And if she has to wait too long after being let out in the morning, she just goes up and sits in the shower waiting for it to be turned on.
She really enjoys playing in the water, we wonder if it was her entertainment when she was chained up as a puppy in the rain or something, as she obviously had very little play, just abuse.