I like the suggestion of the bathing /grooming leash . I Will have to get one..
My dogs do not like bath time either. I bath Chloe in the tub and she is way to small to jump out so I usually can handle her pretty well. I try to keep it very warm in the bathroom so she wont have extra stress.
My other dog is 12 lbs. and she could jump out she just hasn't figured that out yet
With her I found if I fill the tub a bit with warm water and put her in and let her relax a bit before I bath her it helps. I also put toys in the water and let her play like I would a child , though she rarely plays with them she does lay in the water and smack at them , and I think it takes her mind off the bath a bit. Then I bath her. She is usually pretty good now
after she is in the tub , but they are both terrified before they actually get in.