Bathroom for pets and humans.

I’m in the process of making a new bathroom/wash area for my dogs. They are both over 50kg and large enough to utilise a human shower. The concept I have is to build a normal step in shower with a raised “shelf” they can climb on so when I wash them I can get to the underside without having to bend over etc.. pet bathrooms seems to be fairly normal in the US but haven’t seen or heard of any here. My builder seems to think I’m bonkers but prepared to do it. The second image is probably more what I’m thinking but with another drained area in front for humans to shower if needed. Do you guys think it would be a thing in australia? Would prospective home owners want a dog wash station as part of the house and would it add any value?