About the dog is right. Lancelot gestures slightly with the towel.

"I'll grab her with this, carry her quickly through. Hold the bathroom door open and I'll set her in the bath, then we can start getting ourselves wet. I have some dog shampoo for her, it's already in there on the side, I just need an extra pair of hands to stop her helping too much."

Or vaulting out the bathtub , or goodness knows what else.