My dog Pugsley goes to the groomers once a month. I used to bathe her myself, but it got to be too difficult. She absolutly loves being in the bathtub, so much so that when I try to get her out she has a doggy temper tantrum.
The groomers that she goes to now do a great job. She loves going there, she is so relaxed that she actually fell asleep in their bathtub.