I ordered the mini and hooked it up to my utility sink in my back room inside my house. The drain hose went right down my utility drain. Slick!  My dog was calm and secure and this was the fastest bath ever.  Exceptionally well made and sturdy, it went together in about 5 minutes. My dog is cocker spaniel and long haired chihauhau(sp?) and weighs about 21 pounds. I could not wait to call my neice and tell her how great this item is.  She has a schnauser(sp?) and has had real trouble getting her dog bathed without getting freaked out.  Being able to walk all around my dog is just the best, not bending over is even better.  I debated whether or not to buy this item, I am overjoyed that I did and that it works just like it should.  Buy the way the back end of this bath is open and I thought water would spill out, not a drop on my floor.  Very Cool.  Thanks Booster Bath My dog Meg and I thank you.  B Brain