It's called the Woof Washer 360. This As Seen on TV product is a clever approach to washing a dog. I want one, but to use on my kids. It would make bath time so much faster!
The Woof Washer 360 is a perforated garden hose that sprays water from the interior of a circle. You can channel soapy water through it, as well as clean water for rinsing.
One woman in the video says that it's helpful for washing "parts you don't want to touch." Sorry, but I think that's not actually optional, even with this handy tool.