Nearly crashed today staring at a "Cotswold Dog Spa" van. Yes, they do offer Canine Hydrotherapy which I've sneered at before. They even offer "canine sports massage".
What is wrong with the modern dog? If it needs a bath, sure it's a tussle but it can be achieved with simple equipment at home! And if it's ill, you take it to a vet who diagnoses Worms and prescribes dried rhubarb pills.