Mr. Master,
Just some thoughts, because the builder in me can't help myself.
If this is a basement, I think you should put a floor drain in somewhere. Whether for the dog wash area, or the bathroom floor or both, just in case. Water based trap primers as great, for $50 plus some tubing you can do multiple floor drains, but also consider Sureseal. I have no experience with this product though. I can feel the plumbers stink eye on me while writing this.
Also, you said in your first post this is all going to a sump pump? I hope you mean an effluent pump. A normal sump pump won't handle the shit that goes down a toilet and shower. Let alone 2 of them. Plus, most sump basins aren't sealed. You don't want shit sitting in there and stinking up the place.