Me too! Its a good thing, but now everytime I need a shower my male dog thinks its time for a bath! hahahaTool? ...what?why?
I wash her in "human shower" and always just clean bathroom afterwards. It`s not like has parasites on her.
I used positive reinforcement training and now when I tell her "shower time" she walks into the shower, sits down and waits.
When I take out the hair-dryer, she will sit in front of me and wait for me to blow-dry her hair. She loves it.
Most important thing is to not scare your dog with the whole washing process and try to make it enjoyable for them - why I would never use that "stay n wash" restraint shown in your ad.
(So you wont be covered from head to toe in mud next time they need bathing)(and also so they dont get damaged by fear)